Entering BCM Diagnostics

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. 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.

"For a description of the RPO Code(s) shown in this article or any of the images therein, refer to the RPO Code List found at Vehicle/Application ID". RPO Codes