Circuit/System Testing
WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Rear Door Lock Relay Control Circuit Test
- Verify that a test lamp connected to battery voltage illuminates when connected to each of the lock and unlock 1 and 2 fuses in the IP fuse block.
- If the test lamp does not illuminate at all 4 fuses replace the IP fuse block.
- Disconnect the BCM connector C7.
- Verify that the rear door lock actuators unlock when a fused jumper wire is connected to the unlock relay control circuit terminal 9 and briefly applied to ground.
- If the rear door lock actuators do not unlock test the unlock relay control circuit for an open/high resistance. If the circuit tests normal replace the IP fuse block.
- Verify that the rear door lock actuators lock when a fused jumper wire is connected to the lock relay control circuit terminal 7 and briefly applied to battery voltage.
- If the rear door lock actuators do not lock test the lock relay control circuit for an open/high resistance. If the circuit tests normal replace the IP fuse block.
- If the circuits test normal replace the BCM.
Rear Door Lock Actuator Circuit Test
- Verify that a test lamp connected to battery voltage illuminates when connected to each of the lock and unlock 1 and 2 fuses in the IP fuse block.
- If the test lamp does not illuminate at all 4 fuses replace the IP fuse block.
- Disconnect the affected rear door latch connector and connect a test lamp across the lock actuator control circuit terminals.
- Verify that the test lamp illuminates briefly when a lock and unlock switch is activated.
- If the test lamp does not illuminate in both switch positions test the lock actuator control circuits for an open/high resistance or short to ground. If the circuits test normal replace the IP fuse block.
- If the circuits test normal replace the affected door latch.