Body Control Systems

Diagnostic Chart (Part 1 Of 2):

Diagnostic Chart (Part 2 Of 2):

CIRCUIT DESCRIPTION
The Body Control Module (BCM) controls the operation of the fasten seat belt indicator. The fasten seat belt indicator is located in the instrument cluster. The BCM turns ON the fasten seat belt indicator by analyzing the voltage through CKT 529. The fasten seat belt indicator receives ground through CKT 1450. The BCM turns ON the fasten seat belt indicator for 6 seconds when the following conditions are met:
^ The ignition switch is tuned from the OFF position to the RUN position.
^ When the BCM turns ON the fasten seat belt indicator, the BCM will sound the chime at a rate of 50 chimes per second. If the drivers seat belt is fastened during the 6-second period the BCM turns OFF both the fasten seat belt indicator and the chime.

CONDITIONS FOR SETTING THE DTC
The BCM detects a short to B+ or ground in CKT 529.

ACTION TAKEN WHEN THE DTC SETS
The following actions are taken when the DTC sets:
^ The BCM sets the diagnostic trouble code (DTC) 1.
^ The fasten seat belt indicator lamp does not turn ON when CKT 529 is shorted to ground.
^ The fasten seat belt indicator lamp stays on at all times when CKT 529 is shorted to B+.

CONDITIONS FOR CLEARING THE DTC
The following are the conditions for clearing the DTCs:
^ A short to B+ or ground in CKT 529 is no longer present between the BCM and the instrument cluster.
^ After the repairs are completed, refer to Body Control Module Diagnostic Information in order to clear the DTC.

DIAGNOSTIC AIDS
^ Inspect for a short to ground in CKT 529.
^ Inspect for a short to B+ in CKT 529.
^ An internal short to ground in the instrument cluster circuitry.
^ Perform the following test while moving the wiring and connectors. This will cause the malfunction to appear.

TEST DESCRIPTION
The number(s) below refer to the step number(s) on the diagnostic table.
1. Always perform the BCM diagnostic system check before attempting to diagnose this DTC.
2. This step checks for operation of the fasten seat belt indicator.
3. This step checks for a short to ground on CKT 529.
4. This step checks for a short to B+ in CKT 529.
5. This step determines whether the BCM or the instrument cluster is faulty.
6. This step checks for a faulty BCM.