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Home >> Pontiac >> 1998 >> Firebird Formula, Automatic >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Body Control Module >> Diagnostic Tests >> DTC 21/31: Courtesy Lights Feed (Circuit Shorted To Ground) >> Testing

DTC 21/31: Courtesy Lights Feed (Circuit Shorted To Ground): Testing

  1. Check for proper installation of aftermarket electronic equipment. Check for open in COURTESY fuse No. 8 (20-amp) located in instrument panel fuse block. If fuse is okay, go to step 3). If fuse is open, go to next step.
  2. Check for short to ground in Orange wire between BCM and instrument panel fuse block. Repair as necessary. If circuit is okay, replace COURTESY fuse No. 8.
  3. Disconnect BCM Black 6-pin connector C2. Connect a test light between BCM connector C2, terminal "B" (Orange wire) and ground. If test light illuminates, go to step 5). If test light does not illuminate, go to next step.
  4. Check for open in Orange wire between BCM and instrument panel fuse block. Check for open in Red wire between instrument panel fuse block and fusible link "F". Repair as necessary.
  5. Ensure glove box is closed. Using ohmmeter, check resistance between BCM connector C2 terminal "B" (Orange wire) and ground. If resistance is zero ohms, go to next step. If resistance is not zero ohms, go to step 7).
  6. Repair short to ground in Dark Blue/White wire between BCM and appropriate interior light. See WIRING DIAGRAMS  .
  7. Replace BCM.
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