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DTC B2647: Ambient Light Sensor Signal Short To Ground/Open: Testing

  1. If BFC diagnostic system check was performed, go to next step. If BFC diagnostic system check was not performed, see procedures in BFC DIAGNOSTIC SYSTEM CHECK  .
  2. Disconnect ambient light sensor from top of instrument panel. Disconnect BFC Gray 24-pin connector C2. Using DVOM, check resistance between ambient light sensor harness terminal "B" (Yellow/Black wire) and ground. If resistance is infinite, go to step 4). If resistance is not infinite, go to next step.
  3. Repair short to ground in Yellow/Black wire between ambient light sensor and BFC connector C2. Go to step 7).
  4. Using DVOM, check resistance between ambient light sensor harness terminal "B" (Yellow/Black wire) and BFC harness connector C2, terminal A3 (Yellow/Black wire). If resistance is 0-2 ohms, go to step 6). If resistance is not 0-2 ohms, go to next step.
  5. Repair open in Yellow/Black wire between ambient light sensor and BFC connector C2. Go to step 9).
  6. Replace ambient light sensor. Go to next step.
  7. Reconnect all disconnected components. Clear DTCs. Check for DTCs. If DTC B2647 exists, go to next step. If DTC B2647 does not exist, go to step 9).
  8. Replace BFC. See REMOVAL & INSTALLATION  . Go to next step.
  9. Clear DTCs. Perform BFC DIAGNOSTIC SYSTEM CHECK  .
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