Entering the Input/Output Test

After the BCM reads all the DTCs in the memory, the BCM enters the Input/Output test.

The BCM flashes the fasten belts indicator and sounds the chime once when operating one of the following inputs:
^ All the reading courtesy lamp switches
^ The door lock cylinders
^ The driver door lock ajar switch
^ The driver fasten seat belt switch
^ The driver information display (DID)
^ The headlamps OFF switch
^ The IP compartment lamp switch
^ The keyless entry requests for door lock/unlock
^ The keyless entry requests for the alarm (RPO UA6)
^ The passenger door lock ajar switch
^ The power door lock switches
^ The liftgate ajar switch
^ The sliding doors jamb switch(es)
^ The shock sensor
^ The sunshade illuminated mirrors
^ The turn signal switch

If the BCM does not provide a chime feedback then there is an open or short in the circuit or a faulty component.

Perform the following procedure in order to test the BCM outputs:
1. Ensure that the BCM is in the diagnostics mode
2. Turn the IP dimmer switch to the DOME position The BCM enters the output test. The output test includes the following tests:
^ Test 1- De-energizes CKT 1993. Turn off all of the interior lamps.
^ Test 2- Energizes CKT 1393. Provides power to all of the interior lamps.
^ Test 3- Grounds CKT 690. Turns on all of the courtesy lamps.
^ Test 4- Energizes the theft deterrent relay for 1 second by grounding CKT 352. Turns on all of the headlamps (BCM type 4 only).
^ Test 5- Energizes the horn relay for 25 ms by grounding CKT 28. Sounds the horn (BCM type 4 only).
^ Test 6- Turns on the theft deterrent indicator lamp by grounding CKT 749 (BCM type 4 only).
^ Test 7- Turns off the theft deterrent indicator lamp by opening CKT 749 (BCM type 4 only).

The BCM operates the output test in numerical order. In order to move to the next test, cycle the IP dimmer switch from the dome position, to OFF then back to DOME. The BCM sounds the chime a number of times equivalent to the output test number above.