BCM Input/Output Test Procedure

1. Turn off the I/P dimmer switch.
2. Turn the ignition switch to the LOCK position.
3. Remove the BCM PRGRM fuse.
4. Turn the ignition switch to the ACC position.
^ The BCM sounds the chime a number of times equivalent to the BCM type installed on the vehicle.
5. Within 1 second, turn the ignition switch from the ACC position, to the LOCK position, then back to the ACC position.
^ The BCM sounds any DTCs stored.
6. Turn the I/P dimmer switch to the DOME position.

The BCM entered the Input/Output test. The BCM Input/Output consists of:
^ Test 1: De-energizes circuits 1393 and 328 (protected courtesy light output).
^ Test 2: Energizes circuits 1393 and 328.
^ Test 3: Grounds circuit 690 (courtesy lights control).
^ Test 4: Energizes the theft deterrent relay for one second by grounding circuit 301, turning on the exterior lights (BCM type 3 and 4 only).
^ Test 5: Energizes the horn relay for 25 ms by grounding circuit 28, sounding the horn (BCM type 4 only).
^ Test 6: Turns on the security indicator lamp by grounding circuit 749 (BCM type 4 only).
^ Test 7: Turns off the security indicator lamp by opening circuit 749 (BCM type 4 only).

The BCM runs the Input/Output test in numerical order.

To move to the next test, cycle the I/P dimmer switch from DOME, to off, back to DOME. The BCM sounds the chime a number equivalent to the Input/Output test number above. The Input/Output test sequence repeats until the ignition switch is turned to the LOCK position.