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Diagnostic Procedures

WARNING: This page is about a different car, the 1999 GMC Sierra and 1999 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. If BCM diagnostic system check has been performed, go to next step. If BCM diagnostic system check has not been performed, perform BCM diagnostic system check. See BCM DIAGNOSTIC SYSTEM CHECK  under SYSTEM TESTS.
  2. Using scan tool, monitor current DTCs. Disconnect left power door lock switch. If scan tool displays DTC B3138 as current, go to next step. If scan tool does not display DTC B3138 as current, go to step  6 .
  3. Using scan tool, monitor current DTCs. Disconnect right power door lock switch. If scan tool displays DTC B3138 as current, go to next step. If scan tool does not display DTC B3138 as current, go to step  7 .
  4. Disconnect Brown BCM connector C1 and remove connector combs. Using DVOM connected to ground, measure voltage (backprobe) at Brown BCM connector C1 terminal A4 (Light Blue wire). See Figure . If battery voltage exists, go to next step. If battery voltage does not exist, go to step  8 .
  5. Repair short to battery voltage in Light Blue wire between Brown BCM connector C1 terminal A4, lock relay and/or left and right door lock switches. See WIRING DIAGRAMS  . After repair, go to step  9 .
  6. Replace left power door lock switch. After repair, go to step  9 .
  7. Replace right power door lock switch. After repair, go to step  9 .
  8. Replace BCM and program. See BODY CONTROL MODULE (BCM)  under REMOVAL & INSTALLATION.
  9. Reconnect all components. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES (DTCS)  under SELF-DIAGNOSTIC SYSTEM.
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