2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 256

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 256

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 command the liftgate to reverse direction.

Conditions for Running the DTC

The system voltage is 9-16 volts.

Conditions for Setting the DTC

B153F 02

The liftgate module detects a short to ground in the liftgate tape switch signal circuit.

B153F 03

The liftgate module detects less than 3.3 volts in the liftgate tape switch signal circuit.