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Home >> Oldsmobile >> 1998 >> Bravada >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Body Control Module >> Diagnosis & Testing >> DTC B3148: Passenger Door Unlock 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. Check voltage between ground and TBC module harness connector terminal A3 (White wire). If battery voltage is present, go to next step. If battery voltage is not present, go to step 7).
  3. Turn ignition off. Remove passenger door lock relay from BBEC. Check voltage between ground and TBC module harness connector terminal A3 (White wire). If battery voltage is present, go to step 9). If battery voltage is not present, go to step 6).
  4. 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 A3 (White wire). If battery voltage is present, go to step 9). If battery voltage is not present, go to next step.
  5. Install MIR/LKS fuse. Turn ignition switch to RUN position. Connect DVOM between ground and TBC module harness connector terminal A3 (White wire). Observe DVOM. Disconnect left front then the right front door lock switch. If voltage reading goes away when a switch is disconnected, go to step 10). If voltage does not go away when a switch is disconnected, go to step 9).
  6. Turn ignition off. Check resistance between passenger 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 4). If resistance is not infinite on some/all tests, go to step 11).
  7. Reconnect all components. Clear DTCs. Turn ignition off for 10 seconds. Turn ignition switch to RUN position for 3.5 minutes. Check if DTC B3148 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.
  8. 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 12).
  9. Repair short to battery voltage on circuit No. 194 (White wire), including shorted door lock switch or door lock actuator. After repairs, go to step 12).
  10. Replace door lock switch causing short to battery voltage go away. After repairs, go to step 12).
  11. Replace passenger door unlock relay. After replacing relay, go to next step.
  12. 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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