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DTC B2648: Ambient Light Sensor Signal Short To Battery: Testing

  1. If body function controller (BFC) diagnostic system check has been performed, go to next step. If body function controller (BFC) diagnostic system check has not been performed, go toBODY FUNCTION CONTROLLER (BFC) DIAGNOSTIC SYSTEM CHECK  under SYSTEM TESTS.
  2. Disconnect BFC Gray 24-pin connector C2. Disconnect ambient light sensor from top of instrument panel. Using DVOM, measure voltage between ambient light sensor harness terminal "B" (Yellow/Black wire) and ground. See WIRING DIAGRAMS  . If reading is zero volts, go to step  4 . If reading is not zero volts, go to next step.
  3. Repair short to voltage in Yellow/Black wire between ambient light sensor and BFC. After repairs, go to step  5 .
  4. Replace ambient light sensor. After repairs, go to next step.
  5. Reconnect all disconnected components. Clear DTCs. Check for DTCs. If DTC B2648 exists, go to next step. If DTC B2648 does not exist, go to step  7 .
  6. Replace BFC. See BODY FUNCTION CONTROLLER (BFC)  under REMOVAL & INSTALLATION. After repairs, go to next step.
  7. Reconnect all disconnected components and connectors. Clear DTCs. Perform BODY FUNCTION CONTROLLER (BFC) DIAGNOSTIC SYSTEM CHECK  under SYSTEM TESTS.
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