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Test Z: 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.
NOTE: Reviewing seat belt indicator description and operation information will help determine if condition described by customer is normal operation, and may help determine correct symptom diagnostic procedure when a malfunction exists. See SEAT BELT INDICATOR  under DESCRIPTION & OPERATION.
  1. If seat belt indicator description and operation has been reviewed, go to next step. If description and operation has not been reviewed, see SEAT BELT INDICATOR  under DESCRIPTION & OPERATION.
  2. Turn ignition switch to RUN position. 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, go to 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. 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 Body Control Module (BCM) Blue 24-pin harness connector C3. BCM is located behind left side of instrument panel, to left of steering column. See Figure . Disconnect driver seat belt switch 2-pin harness connector. Test Black/White wire between seat belt switch harness connector and BCM Blue harness connector C3 terminal B11 for an open or high resistance. See Figure . If open or high resistance is not found, go to next step. If open or high resistance is found, repair as necessary. After repair, go to step.  10 .
  5. Test Black wire between seat belt switch harness connector and ground point for an open or high resistance. Ground point is located inside left door sill, forward of left front seat. See appropriate GROUND DISTRIBUTION article in WIRING DIAGRAMS. If an open or high resistance is not found, go to next step. If an open or high resistance is found, repair as necessary. After repair, go to step  10 .
  6. Test seat belt switch for an open. If an open is not found, go to step  9 . If an open is found, replace seat belt switch. After repair, go to step  10 .
  7. Turn ignition switch to OFF position. Disconnect Body Control Module (BCM) Blue 24-pin harness connector C3. BCM is located behind left side of instrument panel, to left of steering column. See Figure . Disconnect driver seat belt switch 2-pin harness connector. Test Black/White wire between seat belt switch harness connector and BCM Blue harness connector C3 terminal B11 for short to voltage. See Figure . If short to voltage is not found, go to next step. If short to voltage is found, repair as necessary. After repair, go to step.  10 .
  8. Test seat belt switch for a short. If a short is not found, go to next step. If a short is found, replace seat belt switch. After repair, go to step  10 .
  9. Replace instrument panel cluster. 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  2 . If system operates properly, system is okay.
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