To enter the self-test mode and retrieve DTCs from the body control module (BCM), perform the following:

1. Make sure the ignition switch is OFF.
2. Make sure that the hood, trunk and all doors are closed.
3. Turn the instrument panel dimmer switch to OFF.
4. Remove the fuse labeled MALL PGM.
5. Turn the ignition switch from OFF to ACC.

•	The BCM will sound the type number of the BCM on the chime generator. (2 through 4) Check to see if the BCM type number matches the option codes for the vehicle.

-	Base vehicle -- BCM type 2

-	RPO AU0 -- BCM type 3

-	RPO AU0 and UA6 -- BCM type 4

•	If the BCM does not sound the chime to indicate the type, refer to Cannot Enter BCM Diagnostics .

6. Turn the ignition from ACC to OFF and back to ACC, taking no more that 1 second to complete the action.

•	The BCM now flashes the seat belt indicator and sounds the chime to indicate the stored DTCs in the BCM.

•	The BCM reports the stored DTCs in numerical order from the lowest to the highest.

•	The BCM repeats the series of stored DTCs three times.

•	If the BCM does not flash the seat belt indicator or sound the chime, there are no DTCs stored.

1. Make sure the BCM is in self-test and you have retrieved DTCs.
2. Press and hold the door UNLOCK switch on either front door for 4 seconds.

1. Make sure the BCM is in self-test and you have retrieved DTCs.

•	The BCM enters the input test mode after it repeats the DTC series for the third time.

•	If no DTCs are stored, the BCM enters this mode immediately.

2. The BCM sounds the chime and flashes the seat belts indicator once for each activation of the following inputs:

•	The reading lamp switches

•	The door lock cylinders

•	The door ajar switches

•	The driver seat belt switch

•	The interior door lock switches

•	The driver information display switches

•	The headlamp switch

•	The IP compartment lamp switch

•	The rear compartment lamp switch

•	The sunshade illuminated mirrors

•	The turn signal switch

•	The trip calculator switches

•	The shock sensors

•	The keyless entry requests for lock/unlock

3. If the BCM does not sound the chime and illuminate the seat belt indicator when an input is activated, the input circuit is malfunctioning.

Refer to the affected subsystem diagnostic system check.

1. Make sure the BCM is in self-test and you have retrieved DTCs.
2. Turn the IP dimmer switch to the DOME position to begin the first output test.
3. Turn the IP dimmer switch from DOME to OFF and back to DOME to step through the 7 tests listed:

•	Test 1 - turns OFF all interior lamps

•	Test 2 - turns ON the interior lamps

•	Test 3 - turns ON all courtesy lamps

•	Test 4 - energizes the theft deterrent relay for 1 second and turns ON the headlamps, for BCM Type 4 only

•	Test 5 - energizes the horn relay for 25 ms and turns ON the horn, for BCM Type 4 only

•	Test 6 - turns ON the theft deterrent indicator lamp, for BCM Type 4 only

•	Test 7- turns OFF the theft deterrent indicator lamp, for BCM Type 4 only

4. The BCM sounds the chime to indicate the output test number.
5. Once all tests are completed, the cycle will repeat with each DOME-OFF-DOME cycle of the IP dimmer switch.

Remember that the maximum number of output tests for Type 2 and Type 3 BCMs is 3.

Perform the following to return to normal operation of the BCM:

1. Turn the ignition switch to the OFF position.
2. Install the MALL PGM fuse.
3. Turn the ignition switch to the RUN position.