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Home >> Oldsmobile >> 1998 >> Bravada >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Body Control Module >> Diagnosis & Testing >> DTC B2647: Ambient Light Sensor 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. Install scan tool. Using scan tool, check if DTC B1397 is set as a current code. If code is current, go to step 8). If code is not current, go to next step.
  3. Install scan tool. Turn ignition switch to RUN position. Using scan tool, monitor light sensor voltage. If voltage is .137 volt or less, go to next step. If voltage is not .137 volt or less, problem is intermittent. See DIAGNOSTIC AIDS.
  4. Turn ignition off. Disconnect light sensor connector. Disconnect Purple TBC module harness connector. Check resistance between ground and TBC module harness connector terminals A6 (White wire) and A4 (Gray wire). If resistance is infinite on either circuit, go to next step. If resistance is not infinite on either circuit, go to step 9).
  5. Turn ignition off. Disconnect light sensor connector. Disconnect Purple TBC module harness connector. Check resistance between light sensor connector terminal "B" (White wire) and TBC module harness connector terminal A6 (White wire). Check resistance light sensor connector terminal "A" (Gray wire) and TBC module harness connector A4 (Gray wire). If resistance is infinite on either circuit, go to step 10). If resistance is not infinite on either circuit, go to next step.
  6. Replace light sensor. Reconnect all components and wiring. Clear DTCs. Turn ignition off for 10 seconds. Turn ignition switch to RUN position. Check if DTC B2647 is set as a current code. If code is current, go to next step. If code is not current, go to step 11).
  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. Perform DTC B1397 diagnostic test procedures. After performing DTC B1397 tests, check if DTC B2647 is set as a current code. If code is current, go to step 3). If code is not current, go to step 11).
  9. Repair short to ground on circuit No. 278 (White wire) or on circuit No. 705 (Gray wire). After repairs, go to step 11).
  10. Repair open in circuit No. 278 (White wire) or on circuit No. 705 (Gray wire). After repairs, go to next step.
  11. Clear DTCs. After clearing DTCs, perform TBC module diagnostic system check. See TBC MODULE DIAGNOSTIC SYSTEM CHECK  .
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