Tuesday, June 25, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 598


* Refer to the appropriate replacement procedure for the component causing the condition.



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



B2645



DTC B2645



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 B2645 03



- Ambient Light Sensor Circuit Voltage Below Threshold



DTC B2645 07



- Ambient Light Sensor Circuit Voltage Above Threshold



Diagnostic Fault Information



Circuit/System Description



The ambient light sensor is used to monitor outside lighting conditions. The ambient light sensor provides a voltage signal that will vary depending



on outside lighting conditions. The body control module (BCM) provides a 5 V reference signal to the ambient light sensor. The BCM monitors the



ambient light sensor signal circuit to determine if outside lighting conditions are correct for either daytime running lights (DRL) or automatic lamp



control (ALC) when the headlamp switch is in the AUTO position. In daylight conditions, the BCM will command the DRLs ON. In low light



conditions, when the headlamps switch is in AUTO position, the BCM will command the low beam headlamps ON.



Conditions for Running the DTC



Battery voltage must be between 9-16 V.



Conditions for Setting the DTC



B2645 03



The BCM detects voltage is below 0.196 volt in the ambient light sensor signal circuit.

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 544


1. Ignition OFF, disconnect the cellular antenna coax from the CIM module and the cellular antenna.



2. Ignition ON, test for less than 1 volt between the antenna coax center terminal and ground.



锟斤拷 If greater than the specified range, replace the antenna coax.



3. Ignition ON, test for less than 1 volt between the antenna coax outer shield and ground.



锟斤拷 If greater than the specified range, replace the antenna coax.



4. Test for infinite resistance between the antenna coax center terminal and ground.



锟斤拷 If less than the specified value, replace the antenna coax



5. Test for infinite resistance between the antenna coax outer shield and ground.



锟斤拷 If less than the specified value, replace the antenna coax



6. Test for less than 5 ohms at the cellular antenna coax center terminal from end to end.



锟斤拷 If greater than specified value, replace the cellular antenna coax cable.



7. Test for less than 5 ohms at the cellular antenna coax outer shield from end to end.



锟斤拷 If greater than specified value, replace the cellular antenna coax cable.



8. Test for infinite resistance between the antenna coax center terminal and the outer shield.



锟斤拷 If less than specified value, replace the cellular antenna coax cable.



9. If coax cable tests normal, replace the cellular antenna.



10. Clear the DTCs and operate the vehicle within the conditions for running the DTC. Verify DTC B2470 does not set.



锟斤拷 If the DTC sets, replace the CIM.



Repair Instructions



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



* Cellular Communications/Digital Radio Antenna Replacement (See: Accessories and Optional Equipment/Antenna/Antenna, Radio/Service



and Repair/Cellular Communications/Digital Radio Antenna Replacement)



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



B2474



DTC B2474



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 B2474 07



- Navigation Display Head Backlighting Performance



Circuit Description



The internal backlighting of the navigation display screen located in the navigation radio.



Conditions for Running the DTC



* Radio ON.



* Battery voltage must be between 9-16 volts.

Monday, June 24, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 282


Scan Tool Reference



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



Circuit/System Verification



1. Verify that DTC B1405 is not set.



锟斤拷 If DTC is set, refer to DTC B1405 (See: B1405).



2. Verify that DTC B0958 3A, DTC B0959 3A, DTC B0960 3A, or DTC B0961 3A is not set.



锟斤拷 If DTC is set, replace the appropriate object alarm sensor.



3. Transmission in REVERSE, verify the parking assist system is enabled and one audible beep sounds.



Circuit/System Testing



Single Object Alarm Sensor DTC Set



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



2. Ignition OFF for 30 seconds, test for less than 20 Ohms 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 object



alarm module.



3. Ignition ON, transmission in REVERSE, test for 8.0-9.0 V between the voltage reference circuit terminal 1 and ground.



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



alarm module.



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



replace the object alarm module.



4. Ignition OFF, remove the malfunctioning object alarm sensor and swap locations with another properly functioning object alarm sensor.



Connect the harness connector at both sensors.



5. Ignition ON, verify the DTC is set for the new location in which the malfunctioning object alarm sensor is installed.



锟斤拷 If the DTC does not set for the new location, test the signal circuit terminal 3 for a short to voltage, short to ground, or an open/high



resistance. If the circuit tests normal, replace the object alarm module.



6. If the DTC sets for the new location in which the malfunctioning object alarm sensor is installed, replace the appropriate object alarm sensor.



Multiple Object Alarm Sensor DTCs Set



1. Ignition OFF, disconnect the harness connector at each of the object alarm sensors.



2. Ignition OFF for 30 seconds, test for less than 20 Ohms 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 object



alarm module.



3. Ignition ON, transmission in REVERSE, test for 8.0-9.0 V between the voltage reference circuit terminal 1 and ground.



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



alarm module.



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



replace the object alarm module.



Repair Instructions



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



* Rear Object Sensor Replacement (See: Accessories and Optional Equipment/Collision Avoidance and Parking Assist Systems/Parking Assist



Distance Sensor/Service and Repair/Rear Object Sensor Replacement)



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



programming



B0961



DTC B0958, B0959, B0960, or B0961



Diagnostic Instructions

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 504


3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 6 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. If the circuit tests normal,



replace the MSM.



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



4. Verify the appropriate scan tool driver seat sensor parameter is less than 1 volt.



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



the MSM.



* Seat front vertical position sensor terminal 1



* Seat rear vertical position sensor terminal 5



* Seat horizontal position sensor terminal 3



5. Install a 3A fused jumper wire between the appropriate signal circuit listed below and the 5-volt reference circuit terminal 6. Verify the



appropriate scan tool driver seat position sensor parameter is greater than 4.75 volts.



* Seat horizontal position sensor terminal 3



* Seat front vertical position sensor terminal 1



* Seat rear vertical position sensor terminal 5



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



MSM.



6. If all circuits test normal, test or replace the seat position sensor.



B1850 01, B1850 06, B1860 01 or B1860 06



1. Ignition OFF, disconnect the X2 harness connector at the lumbar adjuster assembly.



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



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



3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal A 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. If the circuit tests normal,



replace the MSM.



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



4. Verify the appropriate scan tool lumbar sensor parameter is less than 1 volt.



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



the MSM.



* Lumbar vertical position sensor terminal B



* Lumbar horizontal position sensor terminal D



5. Install a 3A fused jumper wire between the appropriate signal circuit listed below and the 5-volt reference circuit terminal A. Verify the



appropriate scan tool lumbar sensor parameter is greater than 4.75 volts.



* Lumbar vertical position sensor terminal B



* Lumbar horizontal position sensor terminal D



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



MSM.



6. If all circuits test normal, test or replace the lumbar position sensor.



Repair Instructions



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



* Front Seat Adjuster Replacement (with HP2) ()Front Seat Adjuster Replacement (without HP2) ()



* Seat Lumbar Sub System Replacement ()



* Front Seat Recliner Actuator Motor Replacement ()



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

Sunday, June 23, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 692


B3823



DTC B3819, B3820, B3822, or B3823



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 B3819 00



- Left Rear Window Up Control Circuit



DTC B3820 00



- Left Rear Window Down Control Circuit



DTC B3822 00



- Right Rear Window Up Control Circuit



DTC B3823 00



- Right Rear Window Down Control Circuit



Diagnostic Fault Information



Circuit/System Description



The body control module (BCM) monitors the window UP/DOWN command from the driver door switch (DDS). When the rear window UP or



DOWN command is received, the BCM sends a signal to the appropriate rear window switch. The rear window switches continuously monitor the



up and down signal circuits, if no function is being commanded, the signal voltage is at approximately B+ voltage. If the UP or DOWN function is



commanded, the BCM signal voltage drops approximately 0.5 volts and the appropriate rear window switch will then command the window in the



UP or DOWN direction.



Conditions for Running the DTC

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 535


2. Test for 850 Ohms - 300 kOhms between the signal circuit terminal 3 X5 and the low reference circuit terminal 5 X2.



锟斤拷 If less than the specified range, test for a short between the signal and low reference circuits. If the circuits test normal, replace the seat



back heater element/temperature sensor.



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



test normal, replace the seat back heater element/temperature sensor.



3. Connect the X2, X5 harness connectors at the MSM.



4. Disconnect the harness connector at the seat back heater element/temperature sensor.



5. Ignition ON, test for 4.8 - 5.2 V between the signal circuit terminal C 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



MSM.



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 MSM.



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



Repair Instructions



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



* Driver or Passenger Seat Back Cushion Heater Replacement (Escalade with HP2) ()Driver or Passenger Seat Back Cushion Heater



Replacement (Tahoe with HP2) ()Driver or Passenger Seat Back Cushion Heater Replacement (without HP2) ()



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



HP2 or Dealer Installed W/O Memory



DTC B2435 or B2440 (HP2 or Dealer Installed w/o 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 B2435 02



- Left Seat Back Heater Sensor Circuit Short to Ground



DTC B2435 05



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



DTC B2440 02



- Right Seat Back Heater Sensor Circuit Short to Ground



DTC B2440 05



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



Diagnostic Fault Information

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 632


DTC B3109 00



- Keyless Entry Transmitter 1 Low Battery



DTC B3110 00



- Keyless Entry Transmitter 2 Low Battery



DTC B3111 00



- Keyless Entry Transmitter 3 Low Battery



DTC B3112 00



- Keyless Entry Transmitter 4 Low Battery



Circuit/System Description



With each press of a keyless entry transmitter button, a message containing the current battery state of the transmitter is sent to the remote control



door lock receiver (RCDLR) along with the commanded keyless entry function.



Conditions for Running the DTC



A keyless transmitter button is pressed.



Conditions for Setting the DTC



The DTC sets after 3 consecutive low battery signals from the same programmed transmitter.



Action Taken When the DTC Sets



The keyless entry system is inoperative.



Conditions for Clearing the DTC



The DTC is cleared when a normal transmitter voltage signal is received from the programmed transmitter that set the DTC.



Diagnostic Aids



The keyless entry transmitter used in the 2-Way Advanced Remote Start System is unique to the system. When servicing or replacing a transmitter,



ensure that the correct transmitter is used. The correct transmitter part number can be found in the Accessory section of the parts catalog. Attempting



to replace a 2-Way Advanced Remote Start transmitter with a regular service part may result in a failure to program the transmitter.



Reference Information



Schematic Reference



Remote Function Schematics (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Keyless Entry/Keyless Entry



Transmitter/Diagrams/Electrical Diagrams)



Connector End View Reference



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



Description and Operation



Keyless Entry System Description and Operation (Without Accessory 2 Way Remote) (See: Accessories and Optional Equipment/Antitheft and



Alarm Systems/Keyless Entry/Description and Operation/Keyless Entry System Description and Operation (Without Accessory 2 Way Remote)



)Keyless Entry System Description and Operation (With Accessory 2 Way Remote) (See: Accessories and Optional Equipment/Antitheft and



Alarm Systems/Keyless Entry/Description and Operation/Keyless Entry System Description and Operation (With Accessory 2 Way Remote))



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