2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 258
瀚慖f the liftgate continues to power close, replace the K39 liftgate module.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the B71R liftgate object sensor - right.
2. Test for less than 10 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 module.
3. Disconnect the harness connector at the B71L liftgate object sensor - left.
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 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 module.
5. Test of infinite resistance between the signal circuit terminal B and ground.
瀚慖f not the specified value, test the signal circuit for a short to ground.
6. Test for less than 10 ohm between the signal circuit terminal A at the B71R liftgate object sensor - right and the signal circuit terminal B at
the B71L liftgate object sensor - left.
瀚慖f greater than the specified range, test the signal circuit for an open/high resistance.
7. If all circuits test normal, test or replace the appropriate B71 liftgate object sensor.
Component Testing
1. Ignition OFF, disconnect the harness connector at the appropriate B71 liftgate object sensor.
2. Test for 8K-12K ohm between the signal terminal A and the low reference terminal B.
瀚慖f not within the specified range, replace the B71 liftgate object sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Liftgate Side Upper Sensor Replacement (Except Avalanche and EXT Escalade) (See: Body and Frame/Doors, Hood and Trunk/Trunk /
Liftgate/Trunk / Liftgate Position Sensor/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for the liftgate module replacement, setup and
programming
B0158
DTC B0158, B0163, B0168, B0173, B0178, B0509, B0514, B3578, or B3583
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 B0158 02
- Outside Air Temperature Sensor Circuit Short to Ground
DTC B0158 05
- Outside Air Temperature Sensor Circuit Short to Battery or Open
DTC B0163 02
- Passenger Compartment Temp Sensor 1 Circuit Short to Ground
