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Home >> Oldsmobile >> 1999 >> Bravada >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Body Control Modules >> Diagnostic Tests >> DTC B1398: Drive Reference Out Circuit High >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform BCM diagnostic system check. See BCM DIAGNOSTIC SYSTEM CHECK  under SYSTEM TESTS. After performing system check, go to next step.
  2. Turn ignition on. Using scan tool, monitor current DTCs. Disconnect Purple 16-pin BCM connector. See COMPONENT LOCATIONS  . If scan tool displays DTC B1398, go to step 4). If scan tool does not display DTC B1398, go to next step.
  3. Repair short to voltage in Gray wire between Purple 16-pin BCM connector terminal A4 and ambient light sensor connector. See Figure . Go to step 5).
  4. Replace BCM. See BODY CONTROL MODULE (BCM)  under REMOVAL & INSTALLATION. Program and perform BCM relearn procedure. See PROGRAMMING  . Go to next step.
  5. Clear DTCs. After repairs, perform BCM DIAGNOSTIC SYSTEM CHECK  under SYSTEM TESTS.
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