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Home >> Oldsmobile >> 1999 >> Bravada >> Repair and Diagnosis (Single Page) >> Body & Frame >> Body, Cab Control Systems >> Body Control Modules >> Diagnostic Tests >> DTC B1397: Device Reference Out Circuit Low >> 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. Using scan tool, monitor current DTCs. Disconnect Purple 16-pin BCM connector. See COMPONENT LOCATIONS  . If scan tool displays DTC B1397, go to step 6). If scan tool does not display DTC B1397, go to next step.
  3. Reconnect Purple 16-pin BCM connector. Monitor current DTCs on scan tool while disconnecting ambient light sensor, located below right front speaker grille. If scan tool displays DTC B1397, go to step 5). If scan tool does not display DTC B1397, go to next step.
  4. Replace ambient light sensor. If DTC B1397 resets, go to step 7). If DTC B1397 does not reset, repair is complete.
  5. Repair short to ground in Gray wire between Purple 16-pin BCM connector terminal A4 and ambient light sensor connector. See Fig 1 . Go to step 7).
  6. Replace BCM. See BODY CONTROL MODULE (BCM)  under REMOVAL & INSTALLATION. Program and perform BCM relearn procedure. See PROGRAMMING  . Go to next step.
  7. Clear DTCs. After repairs, perform BCM DIAGNOSTIC SYSTEM CHECK  under SYSTEM TESTS.
Fig 1: Identifying Purple Body Control Module (BCM) Connector Terminals
G99D02307Courtesy of GENERAL MOTORS CORP.
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