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DTC B2647: Ambient Light Sensor Circuit Low: Testing

WARNING: This page is about a different car, the 2000 Chevrolet Corvette. 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, go to BODY CONTROL MODULE DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Connect scan tool to Data Link Connector (DLC). Turn ignition on. Using scan tool, select BCM INPUTS and monitor AMBIENT LIGHT SENSOR data. If scan tool displays 0.1-2.5 volts, go to DIAGNOSTIC AIDS . If scan tool does not display 0.1-2.5 volts, go to next step.
  3. Turn ignition off. Disconnect ambient light sensor connector. Ambient light sensor is located on top of the instrument panel in the defroster grille. Turn ignition on. Monitor AMBIENT LIGHT SENSOR data on scan tool. If scan tool displays less than 0.1 volt, go to next step. If scan tool displays greater than 0.1 volt, go to step  9.
  4. Turn ignition off. Connect a 3-amp jumper wire between ambient light sensor connector terminals "A" (Yellow/Black wire) and "B" (Light Green/Black wire). Turn ignition on. Monitor AMBIENT LIGHT SENSOR data on scan tool. If scan tool displays greater than 3.5 volts, go to next step. If scan tool displays less than 3.5 volts, go to step  7.
  5. Remove fused jumper. Using DVOM, measure voltage between ambient light sensor connector terminals. If voltage is greater than 5 volts, go to next step. If voltage is less than 5 volts, go to step  10.
  6. Check for short to voltage in Yellow/Black wire between BCM and ambient light sensor. If circuit is okay, go to step  11. If faulty circuit is found and repaired, go to step  14.
  7. Check for short to ground in Yellow/Black wire between BCM and ambient light sensor. If circuit is okay, go to next step. If faulty circuit is found and repaired, go to step  14.
  8. Check for short to ground in Light Green/Black wire between BCM and ambient light sensor. If circuit is okay, go to step  11. If faulty circuit is found and repaired, go to step  14.
  9. Check for short to voltage in Light Green/Black wire between BCM and ambient light sensor. If circuit is okay, go to step  11. If faulty circuit is found and repaired, go to step  14.
  10. Check for poor connections at ambient light sensor connector. If faulty connections are found and repaired, go to step  14. If connections are okay, go to step  12.
  11. Check for poor connections at BCM connector C1. If faulty connections are found and repaired, go to step  14. If connections are okay, go to step  13.
  12. Replace ambient light sensor. After repairs, go to step  14.
  13. Replace BCM and program. See BODY CONTROL MODULE (BCM)  under REMOVAL & INSTALLATION. See BCM PROGRAMMING/RPO CONFIGURATION  under PROGRAMMING. After repairs, go to next step.
  14. Turn ignition off. Reinstall all components and connectors. Turn ignition on. Clear DTCs. If DTC resets, go to step  2.
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