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Pinpoint Test E: The Instrument Panel Illumination Does Not Dim

CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.
  1. E1 RETRIEVE THE DIAGNOSTIC TROUBLE CODES (DTCs) FROM THE INSTRUMENT CLUSTER 
    • Check the recorded results from the instrument cluster self-test.
    • Is DTC B1246 present? 

    Yes  : GO to  E3.

    No  : GO to E2  .

  2. E2 CHECK THE INSTRUMENT PANEL DIMMER SWITCH - MONITOR THE INSTRUMENT CLUSTER PID 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster PID
    • Turn the headlamp switch ON.
    • Select and monitor the instrument cluster PID DSWSTAT while rotating the instrument panel dimmer switch from the lowest position to the highest position.
    • Does the PID value agree with the instrument panel dimmer switch position? 

    Yes  : GO to  E7.

    No  : GO to E3  .

  3. E3 CHECK CIRCUIT 8-LE10 (WH/BK) FOR AN OPEN OR A SHORT TO GROUND 
    • Key in OFF position.
    • Turn the headlamp switch OFF.
    • Disconnect: Instrument Panel Dimmer Switch C206.
    • Disconnect: Instrument Cluster C220c.
    • Measure the resistance between the instrument cluster C220c-16, circuit 8-LE10 (WH/BK), harness side and the instrument panel dimmer switch C206-6, circuit 8-LE10 (WH/BK), harness side and; and between the instrument cluster C220c-16, circuit 8-LE10 (WH/BK), harness side and ground.
      Fig 1: Checking Circuit 8-LE10 (WH/BK) For Open Or Short To Ground
      G04692209Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the instrument cluster and the instrument panel dimmer switch, and greater than 10,000 ohms between the instrument cluster and ground? 

    Yes  : GO to E4  .

    No  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

  4. E4 CHECK CIRCUIT 9-LE10 (BN/YE) FOR AN OPEN OR A SHORT TO GROUND 
    • Measure the resistance between the instrument panel dimmer switch C206-4, circuit 9-LE10 (BN/YE), harness side and the instrument cluster C220c-4, circuit 9-LE10 (BN/YE), harness side; and between the instrument panel dimmer switch C206-4, circuit 9-LE10 (BN/YE), harness side and ground.
      Fig 2: Checking Circuit 9-LE10 (BN/YE) For Open Or Short To Ground
      G04692210Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the instrument panel dimmer switch and instrument cluster, and greater than 10,000 ohms between the instrument panel dimmer switch and ground? 

    Yes  : GO to E5  .

    No  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

  5. E5 CHECK CIRCUITS 8-LE10 (WH/BK) AND 9-LE10 (BN/YE) FOR A SHORT TO VOLTAGE 
    • Key in ON position.
    • Measure the voltage between the instrument panel dimmer switch C206-6, circuit 8-LE10 (WH/BK), harness side and ground; and between the instrument panel dimmer switch C206-4, circuit 9-LE10 (BN/YE), harness side and ground.
      Fig 3: Checking Circuits 8-LE10 (WH/BK) And 9-LE10 (BN/YE) For Short To Voltage
      G04692211Courtesy of FORD MOTOR CO.
    • Is any voltage indicated? 

    Yes  : REPAIR the circuit(s) in question. CLEAR the DTCs. REPEAT the self-test.

    No  : GO to E6  .

  6. E6 CHECK THE INSTRUMENT PANEL DIMMER SWITCH 
    • Key in OFF position.
    • While rotating the instrument panel dimmer switch from the minimum brightness level to the maximum brightness level, measure the resistance between the instrument panel dimmer switch C206 pin 4, component side and the instrument panel dimmer switch C206 pin 6, component side.
      Fig 4: Checking Instrument Panel Dimmer Switch
      G04692212Courtesy of FORD MOTOR CO.
    • Does the resistance begin at approximately 1,000 ohms at the minimum brightness level and move to approximately 10 megohms at the maximum brightness level? 

    Yes  : GO to  E8.

    No  : INSTALL a new instrument panel dimmer switch. REFER to INSTRUMENT PANEL DIMMER SWITCH . CLEAR the DTCs. REPEAT the self-test.

  7. E7 CHECK FOR CORRECT FEM OPERATION 
    • Disconnect all the FEM connectors.
    • Check for:
      • Corrosion
      • Pushed-out pins
    • Connect all the FEM connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 

    Yes  : INSTALL a new FEM. REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.

    No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

  8. E8 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION 
    • Disconnect all the instrument cluster connectors.
    • Check for:
      • Corrosion
      • Pushed-out pins
    • Connect all the instrument cluster connectors and make sure they seat correctly.
    • Is the concern still present? 

    Yes  : INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER . TEST the system for normal operation.

    No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

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