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Home >> Oldsmobile >> 1998 >> Bravada >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Body Control Module >> Diagnosis & Testing >> DTC B1477: Retained Accessory Power (Rap) Circuit Low >> 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. Check RAP MaxiFuse(R) (located in underhood electrical center). If fuse is okay, go to next step. If fuse is open, go to step 6).
  3. Turn ignition off and remove key from ignition. Open door (RAP off). Disconnect Brown TBC module harness connector. Remove RAP relay (located in BBEC). Using DVOM, check resistance between ground and Brown TBC module harness connector terminal A7 (Black wire). See WIRING DIAGRAMS  . If reading is infinite, go to next step. If reading is not infinite, go to step 7).
  4. Reconnect all components. Clear DTCs. Turn ignition off. Open, then close both doors. Turn ignition switch to RUN position. Check DTCs. If DTC B1477 is set as current code, go to next step. If DTC B1477 is not set as a current code, DTC is intermittent. See DIAGNOSTIC AIDS.
  5. 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 10).
  6. Ensure Red wire (circuit No. 542) between underhood electrical center and BBEC is not shorted to ground. Repair as necessary. Replace fuse. After repairs, go to step 10).
  7. Disconnect BBEC harness connector. Check resistance between ground and Brown TBC module harness connector terminal A7 (Black wire). If reading is infinite, go to next step. If reading is not infinite, go to step 9).
  8. Replace BBEC. After repairs, go to step 10).
  9. Repair short to ground in Black wire. After repairs, go to next step.
  10. Clear DTCs. After clearing DTCs, perform TBC module diagnostic system check. See TBC MODULE DIAGNOSTIC SYSTEM CHECK  .
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