LEMON Manuals: Even more car manuals for everyone
Home >> Oldsmobile >> 1998 >> Bravada >> Repair and Diagnosis (Single Page) >> Body & Frame >> Body, Cab Control Systems >> Body Control Module >> Diagnosis & Testing >> DTC B2585: Park Light Control Circuit Malfunction >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform TBC module diagnostic system check. See procedures in TBC MODULE DIAGNOSTIC SYSTEM CHECK  . After performing system check, go to next step.
  2. Turn headlight switch to AUTO position (if equipped). Using scan tool, ensure if vehicle is in LIGHT state when performing tests. Release parking brake. Using a dark tape, cover light sensor. Turn ignition to RUN position. If instrument panel light illuminates, go to step 12). If instrument panel light does not illuminate, go to next step.
  3. Turn ignition off. Check PARK LP fuse located in underhood electrical center. If fuse is okay, go to next step. If fuse is open, go to step 13).
  4. Check PARK LPS located in instrument panel fuse block. If fuse is okay, go to next step. If fuse is open, go to step 17).
  5. Disconnect Light Blue TBC module harness connector. Check resistance between BBEC cavity for park light relay circuit No. 1080 (White wire) and TBC module harness connector terminal A5 (White wire). See WIRING DIAGRAMS  . If resistance is 5 ohms or less, go to next step. If resistance is not 5 ohms or less, go to step 21).
  6. Check resistance between park light relay terminals No. 1 and 2. If resistance is 95 ohms or less, go to next step. If resistance is not 95 ohms or less, go to step 22).
  7. Remove PARK LPS fuse from instrument panel fuse block. Check resistance between BBEC cavity for park light relay circuit No. 74 (Light Blue wire) and PARK LPS fuse at fuse block terminal M6. If resistance is 5 ohms or less, go to next step. If resistance is not 5 ohms or less, go to step 23).
  8. Using a fused jumper wire, connect park light relay terminal No. 2 to battery voltage and terminal No. 1 to ground. Check resistance between relay terminals No. 3 and 5. If resistance is 95 ohms or less, go to next step. If resistance is not 95 ohms or less, go to step 22).
  9. Check resistance between PARK LPS fuse terminal "B" and TBC module harness connector terminal B5. If resistance is 5 ohms or less, go to next step. If resistance is not 5 ohms or less, go to step 25).
  10. Install PARK LPS fuse in fuse block. Reconnect all components. Clear DTCs. Turn ignition off for 10 seconds. Turn ignition switch to RUN position. Check DTCs. If DTC B2585 is set as a current code, go to next step. If DTC B2585 is not set as current code, DTC is intermittent. See DIAGNOSTIC AIDS.
  11. Replace TBC module. Program TBC and perform relearn procedure. See procedures in TBC MODULE PROGRAMMING/RPO CONFIGURATION  and TBC/BCM RELEARN PROCEDURE  . After programming module, go to step 26).
  12. Turn ignition off, then go to step 5).
  13. Replace PARK LPS fuse. Turn ignition switch to RUN position. Check fuse. If fuse blows, go to step 16). If fuse does not blow, go to next step.
  14. Clear DTCs. Turn ignition off for 10 seconds. Turn ignition switch to RUN position. Check DTCs. If DTC B2585 is set as a current code, go to next step. If DTC B2585 is not set as current code, go to step 26).
  15. Remove tape covering light sensor, then go to step 4).
  16. Repair short to ground in Orange wire to BBEC. After repairs, go to step 26).
  17. Replace PARK LPS fuse. Remove tape covering light sensor. Turn ignition switch to RUN position. If fuse blows, go to step 19). If fuse does not blow, go to next step.
  18. Cover light sensor with dark tape. Check fuse. If fuse blows, go to step 20). If fuse does not blow, go to step 26).
  19. Repair short to ground in Brown wire between fuse block and TBC module. After repairs, go to step 26).
  20. Repair short to ground in Light Blue wire between BBEC and instrument panel fuse block. After repairs, go to step 26).
  21. Check for open in White wire between TBC module and BBEC. Repair as necessary. After repairs, go to step 26). If circuit is okay, go to step 24).
  22. Replace park light relay. After replacing relay, go to step 26).
  23. Repair open in Light Blue wire between BBEC and instrument panel fuse block. After repairs, go to step 26).
  24. Replace BBEC. After replacing BBEC, go to step 26).
  25. Repair open in Brown wire between TBC module and instrument panel fuse block. After repairs, go to next step.
  26. Clear DTCs. After clearing DTCs, perform TBC module diagnostic system check. See TBC MODULE DIAGNOSTIC SYSTEM CHECK  .
scientia non olet · About LEMON Manuals