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Home › GMC › 1998 › Envoy › Repair and Diagnosis › Body & Frame › Body, Cab Control Systems › Body Control Module › Diagnosis & Testing › DTC B3137: Door Lock 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. Turn ignition off. Remove door lock relay from BBEC. Check resistance between ground and BBEC cavity for door lock relay circuit No. 135 (Light Blue wire). If resistance is infinite, go to next step. If resistance is not infinite, go to step 5).
  3. Check resistance between BBEC cavities for door lock relay circuits No. 195 (Light Blue wire) and No. 295 (Gray wire). If resistance is infinite, go to next step. If resistance is not infinite, go to step 9).
  4. 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 next step. If resistance is not infinite on some/all tests, go to step 10).
  5. Disconnect Brown TBC module harness connector. Check resistance between ground and TBC module harness connector terminal A4 (Light Blue wire). If resistance is infinite, go to next step. If resistance is not infinite, go to step 8).
  6. Reconnect all components. Press LOCK button on RFA transmitter. Check DTCs if DTC B3137 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.
  7. 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).
  8. Repair short to ground in circuit No. 195 (Light Blue wire), including a shorted door lock switch or door lock actuator. After repairs, go to step 11).
  9. Replace BBEC. After replacing BBEC, go to step 11).
  10. Replace door lock 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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