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Test X: Seat Belt Indicator Circuit Malfunction

WARNING: Vehicles are equipped with Supplemental Inflatable Restraint (SIR) system. Before attempting any repairs involving SIR, see SERVICE PRECAUTIONS and DISABLING & ACTIVATING AIR BAG SYSTEM in appropriate AIR BAG RESTRAINT SYSTEMS article.
  1. If seat belt diagnostic system check has not been performed, perform SEAT BELT DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. If seat belt diagnostic system check has been performed, go to next step.
  2. Turn ignition switch to RUN position, with engine off. Observe seat belt indicator while buckling and unbuckling driver seat belt. If system does not operate properly, go to next step. If system operates properly, check for an intermittent or poor connections in related circuits. See DIAGNOSING INTERMITTENTS  .
  3. Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC). DLC is located below left side of instrument panel, to right of steering column. See Figure . Turn ignition switch to RUN position, with engine off. Using scan tool, observe DRIVER SIDE SEAT BELT STATUS parameter in SIR data list. If scan tool displays BUCKLED, go to next step. If scan tool does not display buckled, go to step  7 .
  4. Turn ignition switch to OFF position. Disconnect BCM harness connector C2. Disconnect driver seat belt switch 2-pin harness connector. Test Black/White wire between driver seat belt harness connector terminal "B" and BCM harness connector C2 terminal D1 for high resistance or an open. See Figure . If no problem is found, go to next step. If problem is found, repair as necessary. After repair, go to step  10 .
  5. Test Black wire between ground and driver seat belt harness connector terminal "A" high resistance or an open. See appropriate GROUND DISTRIBUTION article in WIRING DIAGRAMS. If no problem is found, go to next step. If problem is found, repair as necessary. After repair, go to step  10 .
  6. Test seat belt switch for an open. If no problem is found, go to step  9 . If problem is found, replace seat belt switch. After repair, go to step  10 .
  7. Turn ignition switch to OFF position. Disconnect BCM harness connector C2. Disconnect driver seat belt switch 2-pin harness connector. Test Black/White wire between driver seat belt harness connector terminal "B" and BCM harness connector C2 terminal D1 for short to ground or short to voltage. See Figure . If no problem is found, go to next step. If problem is found, repair as necessary. After repair, go to step  10 .
  8. Test seat belt switch for a short. If no problem is found, go to step  9 . If problem is found, replace seat belt switch. After repair, go to step  10 .
  9. Replace Instrument Panel Cluster (IPC). See INSTRUMENT PANEL CLUSTER  under REMOVAL & INSTALLATION. After repair, go to next step.
  10. Operate system to verify repair. If system does not operate properly, go to step  3 . If system operates properly, system is okay.
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