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Home › Oldsmobile › 1998 › Bravada › Repair and Diagnosis › Body & Frame › Body, Cab Control Systems › Body Control Module › Diagnosis & Testing › DTC B3138: Door Lock Circuit High › 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 ignition off. Disconnect Brown TBC module harness connector. Connect DVOM between ground and TBC module harness connector terminals A4 (Light Blue wire). Turn ignition to RUN position. If battery voltage is present, go to next step. If battery voltage is not present, go to step 4).
  3. Turn ignition off. Remove door lock relay from BBEC. Turn ignition switch to RUN position. Connect DVOM between ground and TBC module harness connector terminal A4 (Light Blue wire). If battery voltage is present, go to step 7). If battery voltage is not present, go to step 6).
  4. Reconnect all components. Clear DTCs. Turn ignition off for 10 seconds. Turn ignition switch to RUN position for 3.5 minutes. Check if DTC B3138 is set as a current code. If code is current, go to next step. If code is not current, problem 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 11).
  6. Check resistance between door lock relay terminals No. 1 and 3, terminals No. 1 and 4, and terminals No. 1 and 5. If resistance is infinite on all tests, go to step 9). If resistance is not infinite on some/all tests, go to step 10).
  7. Turn ignition off. Remove MIR/LKS fuse from instrument panel fuse block. Turn ignition switch to RUN position. Connect DVOM between ground and TBC module harness connector terminal A4 (Light Blue wire). If battery voltage is present, go to step 9). If battery voltage is not present, go to next step.
  8. Install MIR/LKS fuse. Turn ignition switch to RUN position. Connect DVOM between ground and TBC module harness connector terminal A4 (Light Blue wire). Observe DVOM. Disconnect left front then the right front door lock switch. Replace door lock switch causing a short to battery voltage. Replace fuse. After repairs, go to step 11).
  9. Repair short to battery voltage on circuit No. 195 (Light Blue wire), including shorted door lock switch or door lock actuator. After repairs, go to step 11).
  10. Replace door unlock relay. After replacing relay, go to next step.
  11. Reconnect all components. Clear DTCs. After clearing DTCs, perform TBC module diagnostic system check. See procedures in TBC MODULE DIAGNOSTIC SYSTEM CHECK  .
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