2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 257
B153F 05
The liftgate module detects a short to voltage or an open/high resistance in the liftgate tape switch signal circuit.
B153F 07
The liftgate module detects greater than 5.5 volts in the liftgate tape switch signal circuit.
Action Taken When the DTC Sets
The liftgate module will prevent any movement of the liftgate while attempting to command the liftgate to power close.
Conditions for Clearing the DTC
* The DTC will be current for as long as the fault is present.
* When the fault is no longer present, the DTC will be a history DTC.
* A history DTC will clear after 50 ignition cycles.
Diagnostic Aids
Important: Before testing can be performed the liftgate must be opened. Refer to Opening the Liftgate Without Electrical Power (See:
Body and Frame/Doors, Hood and Trunk/Trunk / Liftgate/Service and Repair/Procedures) for the appropriate procedure.
Whenever the liftgate module loses power or is disconnected, the ignition must be cycled OFF then ON in order to reactivate the liftgate module.
Reference Information
Schematic Reference
Liftgate Schematics (See: Body and Frame/Doors, Hood and Trunk/Trunk / Liftgate/Diagrams/Electrical Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Liftgate Description and Operation (See: Body and Frame/Doors, Hood and Trunk/Trunk / Liftgate/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
1. Ignition ON, observe the scan tool Object Detection Sensor Status parameter. The reading should be between 3V-3.5V.
瀚慖f 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.
瀚慖f 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.
瀚慖f 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.
