2010 Cadillac Truck SRX AWD V6-3.0L Page 234
power close functions, verify that the liftgate mode switch is in the 3/4 or MAX position.
Reference Information
Schematic Reference
Liftgate Schematics (See: Body and Frame/Locks/Diagrams/Electrical Diagrams/Liftgate Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)
Description and Operation
Liftgate Description and Operation (See: Body and Frame/Doors, Hood and Trunk/Trunk / Liftgate/Description and Operation/Liftgate)
Electrical Information Reference
* 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)
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
1. DTC B153F should not be set as history.
瀚慖f DTC B153F is set only as history, replace both B71 liftgate object sensors
2. Ignition ON, observe the scan tool Liftgate Secondary Obstacle Detection parameter. The reading should be between 3V-3.5V.
瀚慖f not within the specified range, perform the Circuit/System Testing.
3. Observe the scan tool Liftgate Secondary Obstacle Detection parameter while pressing and releasing the B71R liftgate object sensor - right.
The reading should change from 3V-3.5V to 2.25-2.75V as the sensor is pressed and released.
瀚慖f the value does not change, test or replace the B71R liftgate object sensor - right.
4. Observe the scan tool Liftgate Secondary Obstacle Detection parameter while pressing and releasing the B71L liftgate object sensor - left.
The reading should change from 3V-3.5V to 2.25-2.75V as the sensor is pressed and released.
瀚慖f the value does not change, test or replace the B71L liftgate object sensor - left.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the B71L liftgate object sensor - left.
2. Test for less than 30 ohm between the low reference circuit terminal B and ground.
瀚慖f 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 control module.
3. Disconnect the harness connector at the B71R liftgate object sensor - right
4. Ignition ON, test for 4.75-5.25 V between the signal circuit terminal A and ground.
瀚慖f 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 control module.
瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K39 liftgate control
module.
5. Test for less than 10 ohm between the signal circuit terminal B at the B71R liftgate object sensor - right and the signal circuit terminal A at
the B71L liftgate object sensor - left.
瀚慖f greater than the specified range, test the signal circuit between the two sensors for an open/high resistance.
6. If all circuits test normal, test or replace the B71L liftgate object sensors.
