Circuit/System Testing

Rear Door Lock Relay Control Circuit Test

1. 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.
2. Disconnect the BCM connector X7.
3. 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.
4. 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.
5. If the circuits test normal replace the BCM.

Rear Door Lock Actuator Circuit Test

1. 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.
2. Disconnect the affected rear door latch connector and connect a test lamp across the lock actuator control circuit terminals.
3. 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.
4. If the circuits test normal replace the affected door latch.