Tuesday, April 9, 2019

2019 Cadillac Truck Escalade AWD V8-6.2L Diagnostic Instructions Page 174


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



2. Ignition OFF, test for less than 1 ohm between the low reference terminal 11 at the LGM and ground.



锟斤拷 If not the specified range, replace the LGM.



3. Ignition ON, test for 4.8-5.2 volts between 5-volt reference terminal 8 at the LGM and ground.



锟斤拷 If greater than the specified value, replace the LGM.



4. Ignition ON, test for 4.8-5.2 volts are between sensor 1 signal terminal 9 and low reference terminal 11 at the LGM.



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



5. Test for 4.8-5.2 volts between sensor 2 signal terminal 10 and low reference terminal 11 at the LGM.



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



6. If all circuits test normal, test or replace the liftgate motor assembly.



Repair Instructions



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



* Liftgate Close Actuator Motor Replacement (See: Body and Frame/Doors, Hood and Trunk/Trunk / Liftgate/Trunk / Liftgate Motor/Service



and Repair/Liftgate Close Actuator Motor Replacement)



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



B153F



DTC B153F



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 B153F 02



- Liftgate Object Sensor Signal Circuit Short to Ground



DTC B153F 03



- Liftgate Object Sensor Signal Circuit Voltage Below Treshold



DTC B153F 05



- Liftgate Object Sensor Signal Circuit Short to Battery or Open



DTC B153F 07



- Liftgate Object Sensor Signal Circuit Voltage Above Threshold



Diagnostic Fault Information



Circuit/System Description



The liftgate object sensors are pressure sensitive touch tapes located on either side of the upper inside edge of the liftgate panel. The two tape



switches are placed in series between the liftgate object sensor signal circuit and the liftgate object low reference circuit. Each object sensor has a



resistor as well as a switch. The resistors enable the liftgate module to perform diagnostic functions on the circuits. When both touch tape sensors are



not pressed, the 5 volt reference voltage supplied by the liftgate module passes through the resistors and the liftgate module detects approximately



3.3 volts. Pressing a touch tape will cause the voltage to drop to approximately to 2.5 volts indicating an obstruction is present. If the liftgate is in the



open position, the liftgate module will prohibit liftgate movement. If the obstruction occures during the power close function, the liftgate module will

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