Circuit Description
Body Control Module (BCM) controls operation of fasten seat belt warning indicator in the instrument cluster to remind driver to fasten seat belt. With ignition switch turned to ON position, fasten seat belt warning indicator will illuminate for 55 seconds, or until driver fastens seat belt buckle. If seat belt is removed during an ignition cycle or while driving, fasten seat belt warning indicator will illuminate again for 55 seconds. Fasten seat belt warning indicator will not illuminate when fasten seat belt indicator control circuit is shorted to ground. Fasten seat belt warning indicator will remain illuminated when indicator control circuit is shorted to voltage.
- Perform lighting system diagnostic system check. See LIGHTING SYSTEM DIAGNOSTIC SYSTEM CHECK under TROUBLE SHOOTING. Go to next step.
- Turn ignition switch to ON position while monitoring seat belt indicator. If seat belt indicator remains illuminated continuously, go to next step. If seat belt indicator does remain illuminated, go to step 8 .
- Turn ignition switch to LOCK position. Disconnect BCM connector C2. See Fig 1 . Turn ignition switch to ON position. If seat belt indicator remains illuminated continuously, go to step 5 . If seat belt indicator does not remains illuminated continuously, go to next step.
- Replace Body Control Module (BCM). See BODY CONTROL MODULE under REMOVAL & INSTALLATION. If vehicle is equipped with factory installed Central Theft Deterrent (CTD) anti-theft system, perform CTD relearn procedure. See CENTRAL THEFT DETERRENT (CTD) RELEARN under PROGRAMMING. Program feature customization settings. See ENTER FEATURE CUSTOMIZATION MODE under PROGRAMMING. After repair is complete, go to step 10 .
- Disconnect IPC connector C1. See Fig 1 and Fig 2 . Using a DVOM, measure voltage of seat belt supply circuit (Dark Green/White wire) between BCM connector C2 terminal D12 and Instrument Panel Cluster (IPC) connector C1 terminal "E". If reading is less than one volt, go to next step. If reading is one volt or more, go to step 7 .
- Replace IPC. Perform appropriate set up procedure for replacement IPC. See ANALOG INSTRUMENT PANELS - MONTANA, SILHOUETTE & VENTURE article. Contact an authorized A/C Delco service center for transfer of information from failed Instrument Panel Cluster (IPC) or affix appropriate label with necessary vehicle information on driver door pillar. Recheck system operation, go to step 10 .
- Locate and repair short to voltage in seat belt supply circuit (Dark Green/White wire) between BCM connector C2 terminal D12 and IPC connector C1 terminal "E". See Fig 1 and Fig 2 . Check system operation, go to step 10 .
- Disconnect BCM connector C2. Disconnect IPC connector C1. Using DVOM, measure resistance between ground and seat belt supply circuit at BCM connector C2 terminal D12 (Dark Green/White wire). Measure resistance of Dark Green/White wire between IPC connector C1 terminal "E" and BCM connector C2 terminal D12. See Fig 1 and Fig 2 .
- Locate and repair short to ground in seat belt supply circuit (Dark Green/White wire) between BCM connector C2 terminal D12 and IPC connector C1 terminal "E". See Fig 1 and Fig 2 . Recheck system operation, go to next step.
- Clear BCM DTCs. See ON-BOARD DIAGNOSTICS in SELF-DIAGNOSTIC SYSTEM. Operate vehicle in attempt to reset DTC. Check for DTCs. If DTC 3 resets, go to step 2 . If DTC does not remain, system is okay.