Circuit/System Testing
WARNING: This page is about a different car, the 2016 GMC Acadia, 2016 Chevrolet Traverse, and 2016 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector at the B71L Liftgate Object Sensor - Left.
- Test for less than 10 Ω between the low reference circuit terminal A and ground.
- If 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.
- Disconnect the harness connector at the B71R Liftgate Object Sensor - Right.
- Ignition ON, test for 4.75-5.25 V between the signal circuit terminal B and ground.
- If 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.
- If 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.
- Test of infinite resistance between the signal circuit terminal A and ground.
- If not the specified value, test the signal circuit for a short to ground.
- Test for less than 10 Ω 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.
- If greater than the specified range, test the signal circuit for an open/high resistance.
- If all circuits test normal, test or replace the appropriate B71 Liftgate Object Sensor.