Saturday, August 31, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 201


Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



* Ambient Light Sensor Replacement (See: Lighting and Horns/Ambient Light Sensor/Service and Repair)



* Control Module References (See: Testing and Inspection/Programming and Relearning) for HVAC control module replacement, setup, and



programming



B0188



DTC B0183 or B0188



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System



Check - Vehicle) prior to using this diagnostic procedure.



* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an



overview of the diagnostic approach.



* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure



Instructions) provides an overview of each diagnostic category.



DTC Descriptors



DTC B0183 02



- Solar Load Sensor 1 Circuit Short to Ground



DTC B0183 05



- Solar Load Sensor 1 Circuit Short to Battery or Open



DTC B0188 02



- Solar Load Sensor 2 Circuit Short to Ground



DTC B0188 05



- Solar Load Sensor 2 Circuit Short to Battery or Open



Diagnostic Fault Information



Circuit Description



The sunload sensor is a 2-wire photo diode. The vehicle uses left and right sunload sensors. The two sensors are integrated into the sunload sensor



assembly along with the ambient light sensor. Ground and signal circuits enable the sensors to operate. As the sunload increases, the sensor signal



decreases. The sensor signal varies between 0 and 5 volts. The HVAC control module converts the signal to a range between 0 and 255 counts. The



sunload sensor provides the HVAC control module with a measurement of the amount of light shining on the vehicle. Bright or high intensity light



causes the vehicles interior temperature to increase. The HVAC system compensates for the increased temperature by diverting additional cool air



into the vehicle.



The following DTCs are for the left and right sunload sensors.



* B0183 is for the left sunload sensor.



* B0188 is for the right sunload sensor.



Conditions for Running the DTC



Ignition ON.



Conditions for Setting the DTC



The HVAC control module detects the signal circuit is less than 5 counts or greater than 250 counts.



Action Taken When the DTC Sets



* The driver information center (DIC) will display SERVICE A/C SYSTEM.

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 677


* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring



Repairs/Wiring Repairs)



Scan Tool Reference



Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information



Circuit/System Verification



Ignition ON, command the appropriate actuator in both directions with a scan tool. The scan tool door position parameter reading should be between



3 and 253 counts.



Circuit/System Testing



1. Ignition OFF, disconnect the harness connector at the appropriate actuator.



2. Test for less than 10 ohms between the low reference circuit terminal 7 and ground.



锟斤拷 If greater than the specified range, test the low reference circuit for an open/high resistance.



3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 10 and ground.



锟斤拷 If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance.



锟斤拷 If greater than the specified range, test the 5-volt reference circuit for a short to voltage.



4. Verify the appropriate scan tool parameter is greater than 250 counts.



锟斤拷 If greater than the specified range, test the signal circuit terminal 9 for a short to ground.



5. Install a 3-amp fused jumper wire between the signal circuit terminal 9 and the low reference circuit terminal. Verify the appropriate scan tool



parameter is less than 4 counts.



锟斤拷 If less than the specified range, test the signal circuit for a short to voltage or an open/high resistance.



6. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 5 and ground.



锟斤拷 If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.



7. Install a DMM between the actuator control circuit terminal 6 and ground. While monitoring the DMM, use the scan tool to command the



appropriate actuator from one direction to the other. The voltage on the control circuit should move from 0 volts in one direction to 5 volts in



the other direction and 2.5 volts in the at rest state.



锟斤拷 If the voltage does not change, test the control circuit for an open, short to voltage or short to ground. If circuit tests normal replace the



HVAC control module.



8. If all circuits test normal, replace the actuator.



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



* Air Inlet Valve Actuator Replacement (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC -



Automatic/Air Inlet Valve Actuator Replacement)



* Mode Valve Actuator Replacement (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC -



Automatic/Mode Valve Actuator Replacement)



* Temperature Valve Actuator Replacement - Left Side (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and



Repair/HVAC - Automatic/Temperature Valve Actuator Replacement - Left Side)



* Temperature Valve Actuator Replacement - Right Side (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and



Repair/HVAC - Automatic/Temperature Valve Actuator Replacement - Right Side)



* Auxiliary Temperature Valve Actuator Replacement (Behr) (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service



and Repair/HVAC - Automatic/Auxiliary Temperature Valve Actuator Replacement (Behr))Auxiliary Temperature Valve Actuator



Replacement (Delphi) (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC -



Automatic/Auxiliary Temperature Valve Actuator Replacement (Delphi))



* Auxiliary Mode Valve Actuator Replacement (Behr) (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and



Repair/HVAC - Automatic/Auxiliary Mode Valve Actuator Replacement (Behr))Auxiliary Mode Valve Actuator Replacement (Delphi) (See:



Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC - Automatic/Auxiliary Mode Valve Actuator



Replacement (Delphi))



* Control Module References (See: Testing and Inspection/Programming and Relearning)for HVAC control module replacement, setup, and

Friday, August 30, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 264


drivers OFF. Volt meters will not work for this test.



6. Using the L-BU probe J 35616-64B, connect a test light between the TCSCS harness as specified below for the LED control circuit being



tested.



7. Key ON, engine OFF.



8. Using the Special Function ability of the scan tool, command the affected LED ON and OFF. The test light should turn ON and OFF as



commanded.



锟斤拷 If the test light remains illuminated when commanded OFF, test the affected control circuit for a short to ground. If all circuits and



connections test normal, replace the TCCM.



锟斤拷 If the test light remains OFF when commanded ON, test the affected control circuit for an open/high resistance or short to voltage. If all



circuits and connections test normal, replace the TCCM.



TCSCS



1. Using the L-BU probe J 35616-65B, connect the memory saver EL-49741 - harness to the TCSCS as specified below for the LED being



tested. Connecting the harness to the opposite pins will not illuminate the LED.



2. Connect a 9 V battery to the memory saver EL-49741 - harness.



3. Verify that only the indicator being tested illuminates.



锟斤拷 If the indicator does not illuminate when tested or the incorrect indicator illuminates, replace the TCSCS.



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



* Transfer Case Shift Control Switch Replacement (Without SLT) (See: Powertrain Management/Transmission Control Systems/Sensors and



Switches - Transmission and Drivetrain/Sensors and Switches - Transfer Case/Four Wheel Drive Selector Switch/Service and Repair)



* Control Module References (See: Testing and Inspection/Programming and Relearning) for TCSCM replacement, setup, and programming



* Transfer Case High/Low Clutch Reset (See: Transmission and Drivetrain/Transfer Case/Testing and Inspection/Symptom Related Diagnostic



Procedures/MP 3023/3024-NQH - Transfer Case/Transfer Case High/Low Clutch Reset)



MP 3023/3024-NQH - Transfer Case



DTC B0785



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System



Check - Vehicle) prior to using this diagnostic procedure.



* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an



overview of the diagnostic approach.



* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure



Instructions) provides an overview of each diagnostic category.



DTC Descriptors



DTC B0785 01



- 2WD HI Indicator Circuit Short to Battery



DTC B0785 06



- 2WD HI Indicator Circuit Short to Ground or Open



Diagnostic Fault Information

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 267


BCM



1. Key OFF. Disconnect the X1 connector at the TCSCS.



2. Using the L-BU probe J 35616-64B, connect a test light between the indicator dimming control circuit, TCSCS harness X1 pin 4 and a good



ground.



3. Key ON, engine OFF. The test light should be dull or OFF.



锟斤拷 If the test light is bright, test the indicator dimming control circuit for a short to voltage condition. If all circuits and connections test



normal, replace the BCM.



Note: When the DRL sensor turns the headlights OFF the indicator dimming control circuit voltage, TCSCS X1 pin 4, will go from a



diagnostic B+ to a true B+.



4. Place a shop light on the DRL sensor. When the headlights go out the test light should illuminate brightly.



锟斤拷 If the test light is dull or off, test the indicator dimming control circuit for an open/high resistance or short to ground condition. If all



circuits and connections test normal, replace the BCM.



TCCM



1. Key OFF. Disconnect the X1 connector at the TCSCS.



2. Key ON, engine OFF.



3. Using the L-BU probe J 35616-64B, test for 4.5-5.5 V between the 5-volt reference circuit, TCSCS harness X1 pin 11 and a good ground.



锟斤拷 If the voltage is greater than the specified range, test the 5-volt reference circuit for a short to voltage. If all circuits and connections test



normal, replace the TCCM.



锟斤拷 If the voltage is less than the specified range, test the 5-volt reference circuit for an open/high resistance or short to ground. If all circuits



and connections test normal, replace the TCCM.



4. Using the L-BU probes J 35616-64B, connect a test light between the 5-volt reference circuit, TCSCS harness X1 pin 11 and a good ground.



The test light should illuminate dimly.



锟斤拷 If the test light does not illuminate, obtain a different test light and repeat step 4.



5. Key OFF. Wait 30 seconds for the TCCM to shut down.



Note: The TCCM must see the added resistance of the test light on the control circuit at key ON or the TCCM will shut the control circuit



drivers OFF. Volt meters will not work for this test.



6. Using the L-BU probes J 35616-64B, connect a test light between the TCSCS harness as specified below for the LED control circuit being



tested.



7. Key ON, engine OFF.



8. Using the Special Function ability of the scan tool, command the affected LED ON and OFF. The test light should turn OFF and ON as



commanded.



锟斤拷 If the test light remains illuminated when commanded OFF, test the affected control circuit for a short to ground. If all circuits and



connections test normal, replace the TCCM.



锟斤拷 If the test light remains OFF when commanded ON, test the affected control circuit for an open/high resistance or short to voltage. If all



circuits and connections test normal, replace the TCCM.



TCSCS



1. Using the L-BU probes J 35616-65B, connect the EL-49741 - 9 V+ power source harness to the TCSCS as specified below for the LED being



tested. Connecting the harness in the opposite pins will not illuminate the LED.



2. Connect a 9 V battery to the EL-49741 - harness.



3. Verify that only the indicator being tested illuminates.



锟斤拷 If the indicator does not illuminate when tested or the incorrect indicator illuminates, replace the TCSCS.



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 498


- Left Seat Rear Vertical Position Sensor Circuit Plausibility Failure



DTC B2375 01



- Left Seat Assembly Horizontal Position Sensor Circuit Short to Battery



DTC B2375 06



- Left Seat Assembly Horizontal Position Sensor Circuit Short to Ground or Open



DTC B2375 5A



- Left Seat Assembly Horizontal Position Sensor Circuit Plausibility Failure



Diagnostic Fault Information



Circuit Description



The position sensor that sets this diagnostic trouble code (DTC) is either attached to the seat directional motor drive cable or directly to the motor it



monitors. It receives a 5-volt reference and ground from the memory seat module (MSM). The sensor sends a voltage signal that varies with the



movement of the seat through the signal circuit to the MSM. Then based on this voltage signal, the MSM determines the position of the seat.



Conditions for Running the DTC



The memory seat module must be powered.



Conditions for Setting the DTC



B1825 01, B1850 01, B1860 01, B2355 01, B2365 01, B2375 01



If the MSM sees the analog input from this sensor is greater than 4.75 volts, the sensor will be considered out of range and the MSM will set this



DTC.



B1825 06, B1850 06, B1860 06, B2355 06, B2365 06, B2375 06



If the MSM sees the analog input from this sensor is less than 0.22 volts, the sensor will be considered out of range and the MSM will set this DTC.



B1825 5A, B1850 5A, B1860 5A, B2355 5A, B2365 5A, B2375 5A



This DTC will set, if the MSM is controlling a motor in one direction and its position sensor is tracking the motor in the opposite direction. The



sensor is either mounted or wired incorrectly, or the polarity of the motor control circuits are reversed.



Action Taken When the DTC Sets



The MSM disables the memory recall and easy exit/entry action commands of the motor monitored by the sensor. The motor will respond to manual

Thursday, August 29, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 337


* Left front speaker output (+) - terminal 4 X2



* Left front speaker output (-) - terminal 5 X2



* Right front speaker output (+) - terminal 7 X2



* Right front speaker output (-) - terminal 6 X2



* Left rear speaker output (+) - terminal 15 X2



* Left rear speaker output (-) - terminal 14 X2



* Right rear speaker output (+) - terminal 16 X2



* Right rear speaker output (-) - terminal 8 X2



* Front center speaker output (+) - terminal 13 X2



* Front center speaker output (-) - terminal 12 X2



* Right rear midrange speaker output (+) - terminal 3 X2



* Right rear midrange speaker output (-) - terminal 2 X2



* Left rear midrange speaker output (+) - terminal 11 X2



* Left rear midrange speaker output (-) - terminal 10 X2



* Left or rear subwoofer speaker output (+) - terminal 1 X1



* Left or rear subwoofer speaker output (-) - terminal 2 X1



* Right subwoofer speaker output (+) - terminal 7 X1



* Right subwoofer speaker output (-) - terminal 3 X1



锟斤拷 If greater than the specified range, test both circuits of the affected speaker for a short to voltage.



3. Radio OFF, test for infinite resistance between the appropriate signal circuit terminal listed below and ground:



* Left front speaker output (+) - terminal 4 X2



* Left front speaker output (-) - terminal 5 X2



* Right front speaker output (+) - terminal 7 X2



* Right front speaker output (-) - terminal 6 X2



* Left rear speaker output (+) - terminal 15 X2



* Left rear speaker output (-) - terminal 14 X2



* Right rear speaker output (+) - terminal 16 X2



* Right rear speaker output (-) - terminal 8 X2



* Front center speaker output (+) - terminal 13 X2



* Front center speaker output (-) - terminal 12 X2



* Right rear midrange speaker output (+) - terminal 3 X2



* Right rear midrange speaker output (-) - terminal 2 X2



* Left rear midrange speaker output (+) - terminal 11 X2



* Left rear midrange speaker output (-) - terminal 10 X2



* Left or rear subwoofer speaker output (+) - terminal 1 X1



* Left or rear subwoofer speaker output (-) - terminal 2 X1



* Right subwoofer speaker output (+) - terminal 7 X1



* Right subwoofer speaker output (-) - terminal 3 X1



锟斤拷 If less than the specified value, test both circuits of the affected speaker for a short to ground.



4. If all circuits test normal, reconnect all harness connectors at the amplifier.



5. Radio ON, disconnect the appropriate speaker.



6. Test for 5.0-7.5 volts between the signal circuit terminals and ground.



锟斤拷 If less then the specified range test the circuit for an open/high resistance. If the circuit tests normal, replace the amplifier.



锟斤拷 If greater then the specified range test the circuit for a short to voltage. If the circuit tests normal, replace the amplifier.



7. If the circuit tests normal, replace the appropriate speaker.



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



* Speaker Replacement Reference (See: Accessories and Optional Equipment/Testing and Inspection/Symptom Related Diagnostic



Procedures/Cellular, Entertainment, and Navigation/Speaker Replacement Reference)



* Control Module References (See: Testing and Inspection/Programming and Relearning) for Amplifier and Radio replacement, setup, and



programming



B1075



DTC B1025-B1095



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 220


1. Ignition OFF, disconnect the harness connector at the liftglass latch assembly.



2. Test for less than 5 Ohms between the ground circuit terminal 3 and ground.



锟斤拷 If greater than the specified range, test the ground circuit for an open/high resistance.



3. Ignition ON, verify the scan tool Liftgate Ajar Switch parameter is Inactive.



锟斤拷 If not the specified value, test the signal circuit terminal 4 for a short to ground. If the circuit tests normal, replace the LGM.



4. Install a 3A fused jumper wire between the signal circuit terminal 4 and ground. Verify the scan tool Liftgate Ajar Switch parameter is Active.



锟斤拷 If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the



LGM.



5. If all circuits test normal, test or replace the liftglass latch assembly.



Component Testing



1. Ignition OFF, disconnect the harness connector at the liftglass latch assembly.



2. Test for infinite resistance between the signal terminal 4 and the ground terminal 3 with the switch in the open position.



锟斤拷 If not the specified value, replace the liftglass latch assembly.



3. Test for less than 2 Ohms between the signal terminal 4 and the ground terminal 3 with the switch in the closed position.



锟斤拷 If not the specified value, replace the liftglass latch assembly.



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



* Liftgate Window Latch Replacement (See: Body and Frame/Doors, Hood and Trunk/Trunk / Liftgate/Trunk / Liftgate Latch/Service and



Repair/Liftgate Window Latch Replacement)



* Control Module References (See: Testing and Inspection/Programming and Relearning) for LGM replacement, setup, and programming



HVAC - Manual



DTC B0413, B0423, B0433, B3779, or B3782



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System



Check - Vehicle) prior to using this diagnostic procedure.



* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an



overview of the diagnostic approach.



* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure



Instructions) provides an overview of each diagnostic category.



DTC Descriptors



DTC B0413 02



- Temperature Control 1 Feedback Circuit Short to Ground



DTC B0413 05



- Temperature Control 1 Feedback Circuit Short to Battery or Open



DTC B0413 61



- Temperature Control 1 Feedback Circuit Actuator Stuck Open



DTC B0423 02



- Temperature Control 2 Feedback Circuit Short to Ground



DTC B0423 05



- Temperature Control 2 Feedback Circuit Short to Battery or Open



DTC B0423 61



- Temperature Control 2 Circuit Actuator Stuck

Wednesday, August 28, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 576


When the rear fog lamp switch is placed in the ON position, ground is applied to the auxiliary body control module (XBCM) through the rear fog



lamp switch circuit. The XBCM then applies voltage to the rear fog lamp control circuit to the rear fog lamp.



Conditions for Running the DTC



* Battery voltage must be between 9-16 V.



* Rear fog lamps ON.



Conditions for Setting the DTC



B2540 02



The BCM detects a short to ground in the rear fog lamp switch signal circuit.



B2540 05



The BCM detects a short to voltage or an open/high resistance in the rear fog lamp switch signal circuit.



Action Taken When the DTC Sets



The rear fog lamps will not operate when the park lamps are ON and the rear fog lamp switch is active.



Conditions for Clearing the DTC



* The condition responsible for setting the DTC no longer exists.



* A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.



Reference Information



Schematic Reference



Fog Lights Schematics (See: Diagrams/Electrical Diagrams/Lighting and Horns/System Diagram/Fog Lights Schematics)



Connector End View Reference



Component Connector End Views (See: Diagrams/Connector Views)



Description and Operation



Exterior Lighting Systems Description and Operation (See: Lighting and Horns/Description and Operation/Exterior Lighting Systems Description



and Operation)



Electrical Information Reference



* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit



Testing/Circuit Testing)



* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic



Procedures/Connector Repairs/Connector Repairs)



* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General



Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)



* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring



Repairs/Wiring Repairs)



Scan Tool Reference



Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information



Circuit/System Testing



1. Ignition OFF, disconnect the harness connector at the headlamp switch.



2. Verify that a test lamp illuminates between B+ and the ground circuit terminal 8.



锟斤拷 If the test lamp does not illuminate, test the ground circuit for an open/high resistance.



3. Ignition ON, verify the scan tool Rear Fog Lamp Switch parameter is INACTIVE.



锟斤拷 If not the specified value, test the signal circuit terminal 6 for a short to ground. If the circuit tests normal, replace the XBCM.



4. Install a 3 A fused jumper wire between the signal circuit terminal 6 and ground. Verify the scan tool Rear Fog Lamp Switch parameter is



ACTIVE.



锟斤拷 If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 124


3. Ignition ON, test for 4-9 V between the signal circuit terminal 2 and ground.



锟斤拷 If less than the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the



K36 SDM.



锟斤拷 If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K36 SDM.



4. If all circuits test normal, replace the B88 seat position sensor.



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



* Inflatable Restraint Seat Position Sensor Replacement (with HP2) (See: Restraints and Safety Systems/Air Bag Systems/Seat Position



Sensor/Service and Repair)Inflatable Restraint Seat Position Sensor Replacement (without HP2) (See: Restraints and Safety Systems/Air Bag



Systems/Seat Position Sensor/Service and Repair)



* SIR/SRS Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic



Procedures/Wiring Repairs/SIR/SRS Wiring Repairs)



* Control Module References (See: Testing and Inspection/Programming and Relearning)for SDM replacement, setup, and programming



Tahoe/Yukon Hybrid Minus Denali)



DTC B0081 (Tahoe/Yukon Hybrid Minus Denali)



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System



Check - Vehicle) prior to using the diagnostic procedure.



* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an



overview of the diagnostic approach.



* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure



Instructions) provides an overview of each diagnostic category.



DTC Descriptors



DTC B0081 0F



- Passenger Presence System Erratic (sets in the SDM)



DTC B0081 3A



- Passenger Presence System Incorrect Component Installed (sets in the SDM)



DTC B0081 4B



- Passenger Presence System Calibration Not Learned (sets in the passenger presence (PPS) module)



DTC B0081 5A



- Passenger Presence System Plausibility Failure (sets in PPS module)



DTC B0081 39



- Passenger Presence System Internal Electronic Failure (sets in SDM)



DTC B0081 71



- Passenger Presence System Invalid Serial Data Received (sets in SDM)



Circuit/System Description



When the ignition is turned ON, the passenger presence system (PPS) and the inflatable restraint sensing and diagnostic module (SDM) performs



tests to diagnose critical malfunctions. When the SDM has completed the power-up mode, the SDM will establish communication with the PPS



module. The SDM will also request the instrument panel cluster (IPC) to illuminate both of the PASSENGER AIR BAG ON/OFF indicators ON for



5 seconds. If the SDM determines the correct PPS is installed and functioning normally, the SDM will illuminate the passenger air bags ON or OFF



indicator based on messages from the PPS. The SDM sends a message to the IPC to illuminate the appropriate PASSENGER AIR BAG ON/OFF



indicator.



Conditions for Running the DTC



Ignition voltage is between 9-16 volts.



Conditions for Setting the DTC



All of the following conditions must exist for 5 seconds:

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 570


B2508 01



Before the heated seats are activated, the MSM detects a short to battery voltage on the seat heating element supply voltage circuit or control circuit.



Action Taken When the DTC Sets



The heated seat function for both seats will be disabled.



Conditions for Clearing the DTC



* The current DTC clears when the malfunction is no longer present and the power mode changes to OFF then back to ACC or RUN.



* The history DTC will clear after 50 consecutive fault-free ignition cycles have occurred.



Reference Information



Schematic Reference



Heated/Cooled Seat Schematics ()



Connector End View Reference



Component Connector End Views (See: Diagrams/Connector Views)



Description and Operation



Heated Seats Description and Operation (KA1) ()Heated Seats Description and Operation (KA6) ()



Electrical Information Reference



* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit



Testing/Circuit Testing)



* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic



Procedures/Connector Repairs/Connector Repairs)



* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General



Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)



* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring



Repairs/Wiring Repairs)



Scan Tool Reference



Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information



Circuit/System Verification



Verify the type of vehicle and the heated seat system for which the DTC set.



If the DTC set in a vehicle equipped with memory, refer to Circuit/System Testing below.



If the DTC set in a hybrid vehicle without memory, refer to DTC B2508 or B2509 (HP2 w/o memory).



If the DTC set in a non-hybrid vehicle without memory, refer to DTC B2508 or B2509 (Dealer installed).



If the DTC set in the rear heated seat module, refer to DTC B2508 or B2509 (Rear seat).



Circuit/System Testing



1. Ignition OFF, disconnect the X1, X4 harness connectors at the MSM.



2. Test for infinite resistance between the control circuit terminal 14 X1 and ground.



锟斤拷 If not the specified value, test the control circuits listed below for a short to ground:



* Driver seat cushion and back element terminal 14 X1



* Driver seat cushion element terminal 11 X1



* Driver seat back element terminal 1 X1



3. Test for infinite resistance between the control circuit terminal 6 X1 and ground.



锟斤拷 If not the specified value, test the control circuits listed below for a short to ground:



* Passenger seat cushion and back element terminal 6 X1



* Passenger seat cushion element terminal 14 X4



* Passenger seat back element terminal 4 X1



4. Ignition ON, verify that a test lamp does not illuminate between the supply voltage circuit terminal 14 X1 and ground.



锟斤拷 If the test lamp illuminates, test the control circuits listed below for a short to voltage:

Tuesday, August 27, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 330


锟斤拷 If greater than the specified range, test both circuits of the affected speaker for a short to voltage.



3. Radio OFF, test for infinite resistance between the appropriate signal circuit terminal listed below and ground:



* Left front speaker output (+) - terminal 4 X2



* Left front speaker output (-) - terminal 3 X2



* Right front speaker output (+) - terminal 2 X2



* Right front low speaker output (-) - terminal 1 X2



* Left rear speaker output (+) - terminal 8 X2



* Left rear speaker output (-) - terminal 7 X2



* Right rear speaker output (+) - terminal 6 X2



* Right rear speaker output (-) - terminal 5 X2



* Left or rear subwoofer speaker output (+) - terminal 7 X1



* Left or rear subwoofer speaker output (-) - terminal 3 X1



* Right subwoofer speaker output (+) - terminal 6 X1



* Right subwoofer speaker output (-) - terminal 2 X1



锟斤拷 If less than the specified value, test both circuits of the affected speaker for a short to ground.



4. If all circuits test normal, reconnect all harness connectors at the amplifier.



5. Ignition ON, radio ON, disconnect the appropriate speaker.



6. Test for 5.0-7.5 volts between the signal circuit terminals and ground.



锟斤拷 If less then the specified range test the circuit for an open/high resistance. If the circuit tests normal, replace the amplifier.



锟斤拷 If greater then the specified range test the circuit for a short to voltage. If the circuit tests normal, replace the amplifier.



7. If the circuit tests normal, replace the appropriate speaker.



DTC Set by Audio Amplifier UQA with Y91 or UQS



1. Ignition OFF, disconnect the X1 and X2 connectors at the amplifier.



2. Radio ON, test for less than 1 volt between the appropriate signal circuit terminal listed below and ground:



* Left front speaker output (+) - terminal 4 X2



* Left front speaker output (-) - terminal 5 X2



* Right front speaker output (+) - terminal 7 X2



* Right front speaker output (-) - terminal 6 X2



* Left rear speaker output (+) - terminal 15 X2



* Left rear speaker output (-) - terminal 14 X2



* Right rear speaker output (+) - terminal 16 X2



* Right rear speaker output (-) - terminal 8 X2



* Front center speaker output (+) - terminal 13 X2



* Front center speaker output (-) - terminal 12 X2



* Right rear midrange speaker output (+) - terminal 3 X2



* Right rear midrange speaker output (-) - terminal 2 X2



* Left rear midrange speaker output (+) - terminal 11 X2



* Left rear midrange speaker output (-) - terminal 10 X2



* Left or rear subwoofer speaker output (+) - terminal 1 X1



* Left or rear subwoofer speaker output (-) - terminal 2 X1



* Right subwoofer speaker output (+) - terminal 7 X1



* Right subwoofer speaker output (-) - terminal 3 X1



锟斤拷 If greater than the specified range, test both circuits of the affected speaker for a short to voltage.



3. Radio OFF, test for infinite resistance between the appropriate signal circuit terminal listed below and ground:



* Left front speaker output (+) - terminal 4 X2



* Left front speaker output (-) - terminal 5 X2



* Right front speaker output (+) - terminal 7 X2



* Right front speaker output (-) - terminal 6 X2



* Left rear speaker output (+) - terminal 15 X2



* Left rear speaker output (-) - terminal 14 X2



* Right rear speaker output (+) - terminal 16 X2



* Right rear speaker output (-) - terminal 8 X2



* Front center speaker output (+) - terminal 13 X2



* Front center speaker output (-) - terminal 12 X2



* Right rear midrange speaker output (+) - terminal 3 X2



* Right rear midrange speaker output (-) - terminal 2 X2



* Left rear midrange speaker output (+) - terminal 11 X2



* Left rear midrange speaker output (-) - terminal 10 X2

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2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 200


Conditions for Setting the DTC



The HVAC control module detects the signal circuit is less than 5 counts or greater than 250 counts.



Action Taken When the DTC Sets



* The driver information center (DIC) will display SERVICE A/C SYSTEM.



* The system will operate as if no sunload condition exists.



Conditions for Clearing the DTC



* The DTC will become history if the HVAC control module no longer detects the condition that set the DTC.



* The history DTC will clear after 100 fault-free ignition cycles.



Reference Information



Schematic Reference



HVAC Schematics (See: Heating and Air Conditioning/Diagrams/Electrical Diagrams/HVAC - Automatic)



Connector End View Reference



Component Connector End Views (See: Diagrams/Connector Views)



Description and Operation



* Air Temperature Description and Operation (See: Heating and Air Conditioning/Description and Operation/HVAC - Automatic/Air



Temperature Description and Operation)



* Air Delivery Description and Operation (See: Heating and Air Conditioning/Description and Operation/HVAC - Automatic/Air Delivery



Description and Operation)



Electrical Information Reference



* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit



Testing/Circuit Testing)



* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic



Procedures/Connector Repairs/Connector Repairs)



* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General



Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)



* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring



Repairs/Wiring Repairs)



Scan Tool Reference



Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information



Circuit/System Verification



Ignition ON, observe the appropriate scan tool Sunload Sensor parameter. The reading should be between 5 and 250 counts and change with sunlight



intensity.



Circuit/System Testing



Important: If a solar load sensor has an out of range condition caused by a short to voltage, short to ground, or an open/high resistance, the



scan tool will display the same value: 225 counts.



1. Ignition OFF, disconnect the harness connector at the sunload sensor.



2. Test for less than 10 ohms between the ground circuit terminal C and ground.



锟斤拷 If greater than the specified range, test the ground circuit for an open/high resistance.



3. Ignition ON, test for 4.8-5.2 volts between the ground circuit terminal C and the appropriate signal circuit terminal listed below:



* Left solar load sensor circuit terminal A.



* Right solar load sensor circuit terminal B.



锟斤拷 If less than the specified range, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the



HVAC control module.



锟斤拷 If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the HVAC control



module.



4. If all circuits test normal, test or replace the sunload sensor.

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 198


锟斤拷 If not within the specified range, refer to Ambient / Inside Air Temperature Sensor Circuit Malfunction.



2. Measure actual inside air temperature using a thermometer. Compare this value to the scan tool Inside Air Temp. Sensor parameter and Aux.



Inside Air Temp. parameter. The measured temperature should be within 5 degrees of parameter.



锟斤拷 If not within the specified range, refer to Ambient / Inside Air Temperature Sensor Circuit Malfunction.



3. Measure actual temperature using a thermometer at each of the duct temperature sensors. Compare this value to the appropriate scan tool Duct



Actual parameter. The measured temperature should be within 5 degrees of appropriate Duct Actual parameter.



锟斤拷 If not within the specified range, refer to Duct Temperature Sensor Circuit Malfunction.



Circuit/System Testing



Ambient / Inside Air Temperature Sensor Circuit Malfunction



1. Ignition OFF, disconnect the harness connector at the appropriate temperature sensor.



2. Test for less than 1 ohm between the low reference circuit terminal B and ground.



锟斤拷 If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the HVAC



control module.



3. Ignition ON, verify the appropriate scan tool Temp Sensor parameter is greater than 85锟斤拷C (185锟斤拷F).



锟斤拷 If less than the specified range, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the HVAC control



module.



4. Install a 3-amp fused jumper wire between the signal circuit terminal A and the low reference circuit terminal B. Verify the scan tool Temp



Sensor parameter is less than -35锟斤拷C (-39锟斤拷F).



锟斤拷 If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace



the HVAC control module.



5. If all circuits test normal, test or replace the appropriate temperature sensor.



Duct Temperature Sensor Circuit Malfunction



1. Ignition OFF, disconnect the harness connector at the appropriate temperature sensor.



2. Test for less than 1.0 ohm between the low reference circuit terminal 2 and ground.



锟斤拷 If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the HVAC



control module.



3. Ignition ON, verify the appropriate Duct Temp Sensor Actual parameter is greater than 85锟斤拷C (185锟斤拷F).



锟斤拷 If less than the specified range, test the signal circuit terminal 1 for a short to ground. If the circuit tests normal, replace the HVAC control



module.



4. Install a 3-amp fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2. Verify the scan tool Duct



Temp Sensor Actual parameter is less than -35锟斤拷C (-39锟斤拷F).



锟斤拷 If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace



the HVAC control module.



5. If all circuits test normal, test or replace the appropriate temperature sensor.



Component Testing



1. Ignition OFF, disconnect the harness connector at the appropriate temperature sensor.



2. Test for the appropriate resistance between the signal terminal A or 1 and the low reference terminal B or 2. Refer to Sensor Resistance Table



for Sensor Resistance Table (See: Heating and Air Conditioning/Specifications/Electrical Specifications) resistance values.



锟斤拷 If not within the specified range, replace the sensor.



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



* Air Temperature Sensor Replacement - Upper Auxiliary (See: Heating and Air Conditioning/Discharge Air Temperature Sensor /



Switch/Service and Repair/Air Temperature Sensor Replacement - Upper Auxiliary)



* Duct Air Temperature Sensor Replacement - Upper Right Side (See: Heating and Air Conditioning/Discharge Air Temperature Sensor /

Monday, August 26, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 591


(Chevrolet Tahoe Two-mode Hybrid) (See: Lighting and Horns/Headlamp/Service and Repair/Removal and Replacement/Headlamp



Replacement (Chevrolet Tahoe Two-mode Hybrid))Headlamp Replacement (Tahoe, Avalanche) (See: Lighting and Horns/Headlamp/Service



and Repair/Removal and Replacement/Headlamp Replacement (Tahoe, Avalanche))Headlamp Replacement (Escalade PLATINUM) (See:



Lighting and Horns/Headlamp/Service and Repair/Removal and Replacement/Headlamp Replacement (Escalade Platinum))Headlamp



Replacement (Non HID) (See: Lighting and Horns/Headlamp/Service and Repair/Removal and Replacement/Headlamp Replacement (Non



HID))



* Underhood Electrical Center or Junction Block Replacement (See: Maintenance/Fuses and Circuit Breakers/Fuse Block/Service and



Repair/Removal and Replacement/Underhood Electrical Center or Junction Block Replacement)



* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, setup, and programming



B2610



DTC B2610



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System



Check - Vehicle) prior to using this diagnostic procedure.



* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an



overview of the diagnostic approach.



* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure



Instructions) provides an overview of each diagnostic category.



DTC Descriptors



DTC B2610 00



- Passenger Compartment Dimming 1 Circuit



Diagnostic Fault Information

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 516


DTC B2425 04



- Left Seat Heater Cushion Circuit Open



DTC B2425 0A



- Left Seat Heater Cushion Circuit Rate of Change Below Threshold



DTC B2425 0B



- Left Seat Heater Cushion Circuit Current Above Threshold



DTC B2425 0C



- Left Seat Heater Cushion Circuit Current Below Threshold



DTC B2425 0D



- Left Seat Heater Cushion Circuit Resistance Above Threshold



DTC B2425 0E



- Left Seat Heater Cushion Circuit Resistance Below Threshold



DTC B2425 1F



- Left Seat Heater Cushion Circuit Intermittent



DTC B2430 04



- Right Seat Heater Cushion Circuit Open



DTC B2430 0A



- Right Seat Heater Cushion Circuit Rate of Change Below Threshold



DTC B2430 0B



- Right Seat Heater Cushion Circuit Current Above Threshold



DTC B2430 0C



- Right Seat Heater Cushion Circuit Current Below Threshold



DTC B2430 0D



- Right Seat Heater Cushion Circuit Resistance Above Threshold



DTC B2430 0E



- Right Seat Heater Cushion Circuit Resistance Below Threshold



DTC B2430 1F



- Right Seat Heater Cushion Circuit Intermittent



Diagnostic Fault Information

Sunday, August 25, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 664


* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit



Testing/Circuit Testing)



* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic



Procedures/Connector Repairs/Connector Repairs)



* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General



Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)



* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring



Repairs/Wiring Repairs)



Scan Tool Reference



Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information



Circuit/System Verification



Ignition ON, observe the scan tool Pedal Forward Switch and Pedal Aft Switch parameters while cycling the adjustable pedal switch between the



FWD and RWD position. The appropriate parameter should change between Active and Inactive as commanded.



Circuit/System Testing



1. Disconnect the harness connector at the adjustable pedal switch.



2. Ignition ON, test for 11.8-12.2 volts between the appropriate 12-volt reference circuit listed below and ground:



* X88/Z88 - terminal 11



* Z75 - terminal 5



锟斤拷 If greater than the specified range, test the 12-volt reference circuit for a short to voltage. If the circuit tests normal, replace the MSM.



锟斤拷 If less than the specified range, test the 12-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,



replace the MSM.



3. Verify the scan tool Pedal Forward Switch parameter is Inactive.



锟斤拷 If not the specified value, test the appropriate signal circuit terminal listed below for a short to voltage. If the circuit tests normal, replace



the MSM.



* X88/Z88 - terminal 12



* Z75 - terminal 6



4. Verify the scan tool Pedal Aft Switch parameter is Inactive.



锟斤拷 If not the specified value, test the appropriate signal circuit terminal listed below for a short to voltage. If the circuit tests normal, replace



the MSM.



* X88/Z88 - terminal 10



* Z75 - terminal 4



5. Install a 3A fused jumper wire between the appropriate signal circuit terminal listed below and B+. The scan tool Pedal Forward Switch



parameter should be Active.



* X88/Z88 - terminal 12



* Z75 - terminal 6



锟斤拷 If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the



MSM.



6. Install a 3A fused jumper wire between the appropriate signal circuit terminal listed below and B+. The scan tool Pedal Aft Switch parameter



should be Active.



* X88/Z88 - terminal 10



* Z75 - terminal 4



锟斤拷 If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the



MSM.



7. If all circuits test normal, test or replace the adjustable pedal switch.

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 459


RHSM.



锟斤拷 If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the RHSM.



6. If all circuits test normal, replace the RHSM.



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



* Rear Seat Cushion Heater Replacement ()



* Control Module References (See: Testing and Inspection/Programming and Relearning) for the RHSM replacement, setup, and programming



Memory Seat Module



DTC B1925 or B2170 (w/o HP2 with Memory)



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System



Check - Vehicle) prior to using this diagnostic procedure.



* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an



overview of the diagnostic approach.



* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure



Instructions) provides an overview of each diagnostic category.



DTC Descriptors



DTC B1925 02



- Left Seat Heater Cushion Sensor Circuit Short to Ground



DTC B1925 05



- Left Seat Heater Cushion Sensor Circuit Short to Battery or Open



DTC B2170 02



- Right Seat Heater Cushion Sensor Circuit Short to Ground



DTC B2170 05



- Right Seat Heater Cushion Sensor Circuit Short to Battery or Open



Diagnostic Fault Information

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 309


1. Ignition OFF, disconnect the X3 and X4 harness connectors at the amplifier.



2. Radio ON, test for 5.0-7.5 volts between the appropriate signal circuit terminal listed below and ground.



* Left front low level audio signal (+) - terminal 11 X3



* Left front low level audio signal (-) - terminal 12 X3



* Right front low level audio signal (+) - terminal 3 X3



* Right front low level audio signal (-) - terminal 4 X3



* Left rear low level audio signal (+) - terminal 11 X4



* Left rear low level audio signal (-) - terminal 12 X4



* Right rear low level audio signal (+) - terminal 3 X4



* Right rear low level audio signal (-) - terminal 4 X4



* Subwoofer low level audio signal (+) - terminal 5 X4



* Subwoofer low level audio signal (-) - terminal 6 X4



* Center Channel low level audio signal (+) - terminal 13 X4



* Center Channel low level audio signal (-) - terminal 14 X4



锟斤拷 If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the



radio.



锟斤拷 If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.



3. If all circuits test normal, replace the amplifier.



DTC Set By Radio UQA with Y91 and U42 or UQS and U42



1. Ignition OFF, disconnect the X3 and X4 harness connector at the amplifier.



2. Radio ON, test for 5.0-7.5 volts between the appropriate signal circuit terminal listed below and ground.



* Left front low level audio signal (+) - terminal 11 X3



* Left front low level audio signal (-) - terminal 12 X3



* Right front low level audio signal (+) - terminal 3 X3



* Right front low level audio signal (-) - terminal 4 X3



* Subwoofer low level audio signal (+) - terminal 5 X4



* Subwoofer low level audio signal (-) - terminal 6 X4



* Center Channel low level audio signal (+) - terminal 13 X4



* Center Channel low level audio signal (-) - terminal 14 X4



锟斤拷 If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the



radio.



锟斤拷 If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.



3. Ignition OFF, reconnect the X3 harness connector at the amplifier.



4. Disconnect the X2 harness connector at the rear seat audio (RSA) module.



5. Radio ON, test for 5.0-7.5 volts between the appropriate signal circuit terminal listed below and ground.



* Left rear low level audio signal (+) - terminal 1



* Left rear low level audio signal (-) - terminal 2



* Right rear low level audio signal (+) - terminal 3



* Right rear low level audio signal (-) - terminal 4



锟斤拷 If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the



rear seat audio (RSA) module.



锟斤拷 If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the rear seat audio (RSA)



module.



6. Ignition OFF, reconnect the X2 harness connector at the rear seat audio (RSA) module.



7. Disconnect the X2 harness connector at the amplifier.



8. Radio ON, test for 5.0-7.5 volts between the appropriate signal circuit terminal listed below and ground.



* Left rear low level audio signal (+) - terminal 15



* Left rear low level audio signal (-) - terminal 14



* Right rear low level audio signal (+) - terminal 16



* Right rear low level audio signal (-) - terminal 8



锟斤拷 If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the



rear seat audio (RSA) module.



锟斤拷 If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the rear seat audio (RSA)



module.



9. If all circuits test normal, replace the amplifier.



DTC Set by Audio Amplifier UQA

Saturday, August 24, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 234


and Repair/HVAC - Automatic/Auxiliary Temperature Valve Actuator Replacement (Behr))Auxiliary Temperature Valve Actuator



Replacement (Delphi) (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC -



Automatic/Auxiliary Temperature Valve Actuator Replacement (Delphi))



* Auxiliary Mode Valve Actuator Replacement (Behr) (See: Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and



Repair/HVAC - Automatic/Auxiliary Mode Valve Actuator Replacement (Behr))Auxiliary Mode Valve Actuator Replacement (Delphi) (See:



Heating and Air Conditioning/Air Door/Air Door Actuator / Motor/Service and Repair/HVAC - Automatic/Auxiliary Mode Valve Actuator



Replacement (Delphi))



* Control Module References (See: Testing and Inspection/Programming and Relearning)for HVAC control module replacement, setup, and



programming



B0509



DTC B0158, B0163, B0168, B0173, B0178, B0509, B0514, B3578, or B3583



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System



Check - Vehicle) prior to using this diagnostic procedure.



* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an



overview of the diagnostic approach.



* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure



Instructions) provides an overview of each diagnostic category.



DTC Descriptors



DTC B0158 02



- Outside Air Temperature Sensor Circuit Short to Ground



DTC B0158 05



- Outside Air Temperature Sensor Circuit Short to Battery or Open



DTC B0163 02



- Passenger Compartment Temp Sensor 1 Circuit Short to Ground



DTC B0163 05



- Passenger Compartment Temp Sensor 1 Circuit Short to Battery or Open



DTC B0168 02



- Passenger Compartment Temp Sensor 2 Circuit Short to Ground



DTC B0168 05



- Passenger Compartment Temp Sensor 2 Circuit Short to Battery or Open



DTC B0173 02



- Output Air Temperature Sensor 1 Circuit Short to Ground



DTC B0173 05



- Output Air Temperature Sensor 1 Circuit Short to Battery or Open



DTC B0178 02



- Output Air Temperature Sensor 2 Circuit Short to Ground



DTC B0178 05



- Output Air Temperature Sensor 2 Circuit Short to Battery or Open



DTC B0509 02



- Output Air Temperature Sensor 3 Circuit Short to Ground



DTC B0509 05



- Output Air Temperature Sensor 3 Circuit Short to Battery or Open



DTC B0514 02



- Output Air Temperature Sensor 4 Circuit Short to Ground



DTC B0514 05



- Output Air Temperature Sensor 4 Circuit Short to Battery or Open



DTC B3578 02



- Output Air Temperature Sensor 6 Circuit Short to Ground

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 720


锟斤拷 If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the HVAC



control module.



3. Ignition ON, test for 4.8-5.2 volts between the signal circuit terminal 1 and low reference circuit terminal 2.



锟斤拷 If less than the specified range, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the



HVAC control module.



锟斤拷 If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the HVAC control



module.



4. If all circuits test normal, test or replace the evaporator air temperature sensor.



Component Testing



1. Test the evaporator air temperature sensor by varying the sensor temperature while monitoring the sensor resistance.



2. Compare the readings with the Sensor Resistance Table (See: Heating and Air Conditioning/Specifications/Electrical Specifications) and



verify that the resistance is within 5 percent of the specification.



锟斤拷 If not within the specified range, replace the sensor.



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



* Air Conditioning Refrigerant Temperature Sensor Replacement (See: Heating and Air Conditioning/Refrigerant Temperature Sensor/Service



and Repair/HVAC - Automatic)



* Control Module References (See: Testing and Inspection/Programming and Relearning) for HVAC control module replacement, setup, and



programming



B3935



DTC B3935



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System



Check - Vehicle) prior to using this diagnostic procedure.



* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an



overview of the diagnostic approach.



* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure



Instructions) provides an overview of each diagnostic category.



DTC Descriptor



DTC B3935 57



- Transponder Authentication Error



Circuit/System Description



When an ignition key is inserted into the ignition lock cylinder and the ignition is switched ON, the transponder embedded in the head of the key is



energized by the exciter coils surrounding the ignition lock cylinder. The energized transponder transmits a signal that contains its unique value,



which is received by the theft deterrent module (TDM). The TDM then compares this value to a value stored in memory. This stored value is the



learned key code. If the value is correct, the TDM will send the prerelease password via the serial data circuit to the engine control module (ECM).



If the transponder value does not match the learned key code or a transponder value is not received, the TDM will send the start disable password to



the ECM.



Conditions for Running the DTC



* Ignition is in the Accessory or Run position.



* A valid transponder value has been read.



Conditions for Setting the DTC



* The transponder value is valid and matches the value stored in the TDM memory.



* The transponder calculation to the challenge from the TDM does not match the TDM calculation.



Action Taken When the DTC Sets



* Vehicle starting will be disabled.

Friday, August 23, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 176


锟斤拷 If not within the specified range, perform the Circuit/System Testing.



2. Observe the scan tool Object Sensor Supply Voltage parameter while pressing and releasing the B71R liftgate object sensor - right. The



reading should change from Inactive to Active as the sensor is pressed and released.



锟斤拷 If the value does not change, test or replace the B71R liftgate object sensor - right.



3. Observe the scan tool Object Sensor Supply Voltage parameter while pressing and releasing the B71L liftgate object sensor - left. The reading



should change from Inactive to Active as the sensor is pressed and released.



锟斤拷 If the value does not change, test or replace the B71L liftgate object sensor - left.



4. Command the liftgate to power close by pressing the B70 liftgate close switch and as the liftgate is closing, press the B71R liftgate object



sensor - right or the B71L liftgate object sensor - left. The liftgate should stop and power open.



锟斤拷 If the liftgate continues to power close, replace the K39 liftgate module.



Circuit/System Testing



1. Ignition OFF, disconnect the harness connector at the B71R liftgate object sensor - right.



2. Test for less than 10 ohm between the low reference circuit terminal B and ground.



锟斤拷 If greater than the specified range, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal,



replace the K39 liftgate module.



3. Disconnect the harness connector at the B71L liftgate object sensor - left.



4. Ignition ON, test for 4.75-5.25 V between the signal circuit terminal A and ground.



锟斤拷 If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the



K39 liftgate module.



锟斤拷 If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K39 liftgate module.



5. Test of infinite resistance between the signal circuit terminal B and ground.



锟斤拷 If not the specified value, test the signal circuit for a short to ground.



6. Test for less than 10 ohm between the signal circuit terminal A at the B71R liftgate object sensor - right and the signal circuit terminal B at the



B71L liftgate object sensor - left.



锟斤拷 If greater than the specified range, test the signal circuit for an open/high resistance.



7. If all circuits test normal, test or replace the appropriate B71 liftgate object sensor.



Component Testing



1. Ignition OFF, disconnect the harness connector at the appropriate B71 liftgate object sensor.



2. Test for 8K-12K ohm between the signal terminal A and the low reference terminal B.



锟斤拷 If not within the specified range, replace the B71 liftgate object sensor.



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



* Liftgate Side Upper Sensor Replacement (Except Avalanche and EXT Escalade) (See: Body and Frame/Doors, Hood and Trunk/Trunk /



Liftgate/Trunk / Liftgate Position Sensor/Service and Repair)



* Control Module References (See: Testing and Inspection/Programming and Relearning) for the liftgate module replacement, setup and



programming



B0158



DTC B0158, B0163, B0168, B0173, B0178, B0509, B0514, B3578, or B3583



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System



Check - Vehicle) prior to using this diagnostic procedure.



* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an



overview of the diagnostic approach.

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 135


DTC B0087 71



- LR Side Impact Sensor Invalid Serial Data Received



DTC B0088 00



- RR Side Impact Sensor No Additional Information



DTC B0088 0F



- RR Side Impact Sensor Erratic



DTC B0088 39



- RR Side Impact Sensor Internal Electronic Failure



DTC B0088 3A



- RR Side Impact Sensor Incorrect Component Installed



DTC B0088 71



- RR Side Impact Sensor Invalid Serial Data Received



Diagnostic Fault Information



Circuit/System Description



The inflatable restraint front end sensor utilizes a unidirectional 2-wire circuit. The front end sensor modulates current on the interface to send ID,



state of health, and deployment commands to the inflatable restraint sensing and diagnostic module (SDM). The SDM serves as a power source and



a ground for the front end sensor. When the ignition is turned ON and input power from the SDM is first detected, the front end sensor responds by



performing internal diagnostics and sending an ID to the SDM. The SDM considers the ID to be valid if the response time is less than 5 seconds.



The front end sensor continually communicates status messages to the SDM, which determines if a fault is present in the front end sensor circuit.



When a fault is detected, the SDM may reset the front end sensor up to 2 times by removing and reapplying power to it. If the fault is still present,



the SDM will set a DTC.



Conditions for Running the DTC



Ignition voltage is between 9-16 volts.



Conditions for Setting the DTC



Any of the following conditions exist for 2.5 seconds:



B0083 00, B0084 00, B0085 00, B0086 00, B0087 00, B0088 00



* The front end sensor has been shorted to voltage, open, or shorted to ground.



* The front end sensor current has been above 23 mA for longer than 5 milliseconds.



* The SDM has not received a message from the front end sensor for more than 375 milliseconds.



B0083 0F, B0084 0F, B0085 0F, B0086 0F, B0087 0F, B0088 0F



The SDM has received erratic messages from the front end sensor.



B0083 39, B0084 39, B0085 39, B0086 39, B0087 39, B0088 39



* The SDM has received a Not Ok (NOK) message from the front end sensor.



* The SDM has not received a message.



* The SDM has received invalid serial data from the front end sensor.

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 613


DTC B2875 01



- Tilt Down Switch Circuit Short to Battery



Diagnostic Fault Information



Circuit Description



The memory seat module (MSM) receives voltage inputs from the tilt switch based on the position of the switch. The MSM then supplies battery



voltage and a ground to the tilt motor control circuits depending on which direction of movement is requested.



Conditions for Running the DTC



The ignition ON.



Conditions for Setting the DTC



The MSM detects a tilt switch input for more than 30 consecutive seconds after the tilt motor movement has stopped.



Action Taken When the DTC Sets



* The tilt motor will be deactivated.



* Memory recall functions will be disabled.



Conditions for Clearing the DTC



* A current DTC will clear when the failed switch input is no longer active.



* A history DTC will clear after 100 ignition cycles.



Diagnostic Aids



An intermittently stuck tilt switch may cause a DTC to set.



Reference Information



Schematic Reference



Steering Wheel Schematics (See: Diagrams/Electrical Diagrams/Steering/Steering Column/Steering Wheel Schematics)



Connector End View Reference



Component Connector End Views (See: Diagrams/Connector Views)



Description and Operation



Steering Wheel and Column Description and Operation (See: Steering and Suspension/Steering/Steering Column/Description and Operation)



Electrical Information Reference



* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit



Testing/Circuit Testing)



* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic



Procedures/Connector Repairs/Connector Repairs)



* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General



Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)



* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring



Repairs/Wiring Repairs)



Scan Tool Reference



Control Module References (See: Testing and Inspection/Programming and Relearning) for Scan Tool Information



Circuit/System Verification



Ignition ON,observe the scan tool Tilt Up Switch parameter and Tilt Down Switch parameter while cycling the switch between states.The reading



should be Inactive and change to Active when pushing the appropriate switch.

Thursday, August 22, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 194


1. Ignition OFF, disconnect the harness connector at the appropriate temperature sensor.



2. Test for the appropriate resistance between the signal terminal A or 1 and the low reference terminal B or 2. Refer to Sensor Resistance Table



for Sensor Resistance Table (See: Heating and Air Conditioning/Specifications/Electrical Specifications) resistance values.



锟斤拷 If not within the specified range, replace the sensor.



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



* Air Temperature Sensor Replacement - Upper Auxiliary (See: Heating and Air Conditioning/Discharge Air Temperature Sensor /



Switch/Service and Repair/Air Temperature Sensor Replacement - Upper Auxiliary)



* Duct Air Temperature Sensor Replacement - Upper Right Side (See: Heating and Air Conditioning/Discharge Air Temperature Sensor /



Switch/Service and Repair/Duct Air Temperature Sensor Replacement - Upper Right Side)



* Duct Air Temperature Sensor Replacement - Upper Left Side (See: Heating and Air Conditioning/Discharge Air Temperature Sensor /



Switch/Service and Repair/Duct Air Temperature Sensor Replacement - Upper Left Side)



* Air Temperature Sensor Replacement - Lower Auxiliary (Delphi) (See: Heating and Air Conditioning/Discharge Air Temperature Sensor /



Switch/Service and Repair/Air Temperature Sensor Replacement - Lower Auxiliary (Delphi))



* Duct Air Temperature Sensor Replacement - Lower Left Side (See: Heating and Air Conditioning/Discharge Air Temperature Sensor /



Switch/Service and Repair/Duct Air Temperature Sensor Replacement - Lower Left Side)



* Duct Air Temperature Sensor Replacement - Lower Right Side (See: Heating and Air Conditioning/Discharge Air Temperature Sensor /



Switch/Service and Repair/Duct Air Temperature Sensor Replacement - Lower Right Side)



* Ambient Air Temperature Sensor Replacement (See: Heating and Air Conditioning/Ambient Temperature Sensor / Switch HVAC/Service



and Repair)



* Inside Air Temperature Sensor Replacement (See: Heating and Air Conditioning/Cabin Temperature Sensor / Switch/Service and Repair)



* Auxiliary Inside Air Temperature Sensor Assembly Replacement (See: Heating and Air Conditioning/Discharge Air Temperature Sensor /



Switch/Service and Repair/Auxiliary Inside Air Temperature Sensor Assembly Replacement)



* Control Module References (See: Testing and Inspection/Programming and Relearning) for HVAC control module replacement, setup, and



programming



B0178



DTC B0158, B0163, B0168, B0173, B0178, B0509, B0514, B3578, or B3583



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System



Check - Vehicle) prior to using this diagnostic procedure.



* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an



overview of the diagnostic approach.



* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure



Instructions) provides an overview of each diagnostic category.



DTC Descriptors



DTC B0158 02



- Outside Air Temperature Sensor Circuit Short to Ground



DTC B0158 05



- Outside Air Temperature Sensor Circuit Short to Battery or Open



DTC B0163 02



- Passenger Compartment Temp Sensor 1 Circuit Short to Ground



DTC B0163 05



- Passenger Compartment Temp Sensor 1 Circuit Short to Battery or Open



DTC B0168 02



- Passenger Compartment Temp Sensor 2 Circuit Short to Ground



DTC B0168 05



- Passenger Compartment Temp Sensor 2 Circuit Short to Battery or Open



DTC B0173 02



- Output Air Temperature Sensor 1 Circuit Short to Ground



DTC B0173 05



- Output Air Temperature Sensor 1 Circuit Short to Battery or Open

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2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 88


DTC B051C 62:Left Side Assist Step Position Sensor Circuit Actuator Stuck Open



DTC B051C 63:Left Side Assist Step Position Sensor Circuit Actuator Stuck Closed



DTC B051D 2A:Right Side Assist Step Position Sensor Circuit Too Many Pulses



DTC B051D 22:Right Side Assist Step Position Sensor Circuit Low Time < Minimum



DTC B051D 29:Right Side Assist Step Position Sensor Circuit Too Few Pulses



DTC B051D 62:Right Side Assist Step Position Sensor Circuit Actuator Stuck Open



DTC B051D 63:Right Side Assist Step Position Sensor Circuit Actuator Stuck Closed



Diagnostic Fault Information

Wednesday, August 21, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 189


锟斤拷 If not within the specified range, refer to Ambient / Inside Air Temperature Sensor Circuit Malfunction.



2. Measure actual inside air temperature using a thermometer. Compare this value to the scan tool Inside Air Temp. Sensor parameter and Aux.



Inside Air Temp. parameter. The measured temperature should be within 5 degrees of parameter.



锟斤拷 If not within the specified range, refer to Ambient / Inside Air Temperature Sensor Circuit Malfunction.



3. Measure actual temperature using a thermometer at each of the duct temperature sensors. Compare this value to the appropriate scan tool Duct



Actual parameter. The measured temperature should be within 5 degrees of appropriate Duct Actual parameter.



锟斤拷 If not within the specified range, refer to Duct Temperature Sensor Circuit Malfunction.



Circuit/System Testing



Ambient / Inside Air Temperature Sensor Circuit Malfunction



1. Ignition OFF, disconnect the harness connector at the appropriate temperature sensor.



2. Test for less than 1 ohm between the low reference circuit terminal B and ground.



锟斤拷 If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the HVAC



control module.



3. Ignition ON, verify the appropriate scan tool Temp Sensor parameter is greater than 85锟斤拷C (185锟斤拷F).



锟斤拷 If less than the specified range, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the HVAC control



module.



4. Install a 3-amp fused jumper wire between the signal circuit terminal A and the low reference circuit terminal B. Verify the scan tool Temp



Sensor parameter is less than -35锟斤拷C (-39锟斤拷F).



锟斤拷 If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace



the HVAC control module.



5. If all circuits test normal, test or replace the appropriate temperature sensor.



Duct Temperature Sensor Circuit Malfunction



1. Ignition OFF, disconnect the harness connector at the appropriate temperature sensor.



2. Test for less than 1.0 ohm between the low reference circuit terminal 2 and ground.



锟斤拷 If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the HVAC



control module.



3. Ignition ON, verify the appropriate Duct Temp Sensor Actual parameter is greater than 85锟斤拷C (185锟斤拷F).



锟斤拷 If less than the specified range, test the signal circuit terminal 1 for a short to ground. If the circuit tests normal, replace the HVAC control



module.



4. Install a 3-amp fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2. Verify the scan tool Duct



Temp Sensor Actual parameter is less than -35锟斤拷C (-39锟斤拷F).



锟斤拷 If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace



the HVAC control module.



5. If all circuits test normal, test or replace the appropriate temperature sensor.



Component Testing



1. Ignition OFF, disconnect the harness connector at the appropriate temperature sensor.



2. Test for the appropriate resistance between the signal terminal A or 1 and the low reference terminal B or 2. Refer to Sensor Resistance Table



for Sensor Resistance Table (See: Heating and Air Conditioning/Specifications/Electrical Specifications) resistance values.



锟斤拷 If not within the specified range, replace the sensor.



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



* Air Temperature Sensor Replacement - Upper Auxiliary (See: Heating and Air Conditioning/Discharge Air Temperature Sensor /



Switch/Service and Repair/Air Temperature Sensor Replacement - Upper Auxiliary)



* Duct Air Temperature Sensor Replacement - Upper Right Side (See: Heating and Air Conditioning/Discharge Air Temperature Sensor /

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 308


锟斤拷 If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.



锟斤拷 If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the



radio.



4. If all circuits test normal, replace the speaker.



DTC Set By The Radio UQA



1. Ignition OFF, disconnect the X3 harness connector at the amplifier.



2. Radio ON, test for 5.0-7.5 volts between the appropriate signal circuit terminal listed below and ground.



* Left front low level audio signal (+) - terminal 15



* Left front low level audio signal (-) - terminal 7



* Right front low level audio signal (+) - terminal 14



* Right front low level audio signal (-) - terminal 6



* Left rear low level audio signal (+) - terminal 13



* Left rear low level audio signal (-) - terminal 5



* Right rear low level audio signal (+) - terminal 12



* Right rear low level audio signal (-) - terminal 4



锟斤拷 If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the



radio.



锟斤拷 If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.



3. If all circuits test normal, replace the amplifier.



DTC Set By Radio UQA with U42



1. Ignition OFF, disconnect the X3 harness connector at the amplifier.



2. Radio ON, test for 5.0-7.5 volts between the appropriate signal circuit terminal listed below and ground.



* Left front low level audio signal (+) - terminal 15



* Left front low level audio signal (-) - terminal 7



* Right front low level audio signal (+) - terminal 14



* Right front low level audio signal (-) - terminal 6



锟斤拷 If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the



radio.



锟斤拷 If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.



3. Ignition OFF, reconnect the X3 harness connector at the amplifier.



4. Disconnect the X2 harness connector at the rear seat audio (RSA) module.



5. Radio ON, test for 5.0-7.5 volts between the appropriate signal circuit terminal listed below and ground.



* Left rear low level audio signal (+) - terminal 1



* Left rear low level audio signal (-) - terminal 2



* Right rear low level audio signal (+) - terminal 3



* Right rear low level audio signal (-) - terminal 4



锟斤拷 If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the



rear seat audio (RSA) module.



锟斤拷 If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the rear seat audio (RSA)



module.



6. Ignition OFF, reconnect the X2 harness connector at the rear seat audio (RSA) module.



7. Disconnect the X3 harness connector at the amplifier.



8. Radio ON, test for 5.0-7.5 volts between the appropriate signal circuit terminal listed below and ground.



* Left rear low level audio signal (+) - terminal 13



* Left rear low level audio signal (-) - terminal 5



* Right rear low level audio signal (+) - terminal 12



* Right rear low level audio signal (-) - terminal 4



锟斤拷 If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the



rear seat audio (RSA) module.



锟斤拷 If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the rear seat audio (RSA)



module.



9. If all circuits test normal, replace the amplifier.



DTC Set By Radio UQA with Y91 and U42 or UQS and U42

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 706


* The TBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.



Reference Information



Schematic Reference



Trailer Brake Control Schematics (See: Brakes and Traction Control/Diagrams/Electrical Diagrams)



Connector End View Reference



Component Connector End Views (See: Diagrams/Connector Views)



Description and Operation



Trailer Brake Controls Description and Operation (See: Powertrain Management/Computers and Control Systems/Description and



Operation/Trailer Brake Controls Description and Operation)



Electrical Information Reference



* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit



Testing/Circuit Testing)



* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic



Procedures/Connector Repairs/Connector Repairs)



* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General



Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)



* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring



Repairs/Wiring Repairs)



Scan Tool Reference



Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information



Circuit/System Verification



Ignition ON, press the brake pedal. The brake lights should illuminate and the Brake Switch Status parameter should indicate ON.



Circuit/System Testing



1. Verify that DTC B3445, C0277, C0297, or C0890 are not set.



锟斤拷 If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code



Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle).



2. Ignition OFF, disconnect the harness connector of the trailer brake control module.



3. Ignition ON, test for greater than 11 V between the IGN 1 voltage circuit terminal 15 and ground.



锟斤拷 If less than the specified voltage, test the IGN 1 voltage circuit for a short to ground or an open/high resistance. If the circuit test normal



and the MISC - IGN fuse is open, test the signal circuit terminal 37 for a short to ground. If the circuit tests normal, test or replace the



RUN/CRANK relay.



4. If all the circuits test normal, replace the trailer brake control module.



Repair Instructions



Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.



* Relay Replacement (Attached to Wire Harness) (See: Power and Ground Distribution/Power Distribution Relay/Service and Repair/Relay



Replacement (Attached to Wire Harness))Relay Replacement (Within an Electrical Center) (See: Power and Ground Distribution/Power



Distribution Relay/Service and Repair/Relay Replacement (Within an Electrical Center))



* Control Module References (See: Testing and Inspection/Programming and Relearning) for TBCM replacement, setup, and programming



Gasoline Without LY6



DTC B3894 (Gasoline Without LY6)



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System



Check - Vehicle) prior to using this diagnostic procedure.



* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an



overview of the diagnostic approach.



* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure



Instructions) provides an overview of each diagnostic category.