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Home >> Ford >> 2006 >> Expedition 4WD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Cluster System And Panel Illumination >> Diagnosis And Testing >> Instrument Cluster and Panel Illumination >> Symptom Table >> Pinpoint Test A: The Control Illumination Is Inoperative >> Pinpoint Test A: The Control Illumination Is Inoperative

Pinpoint Test A: The Control Illumination Is Inoperative

CAUTION: Use the correct probe adaptor(s). Failure to use the correct probe adaptor(s) may damage the connector.
  1. A1 CHECK THE EXTERIOR LAMPS 
    • Place the headlamp switch in the ON position.
    • Do the exterior lamps illuminate? 

    Yes:  GO to  A2.

    No:  VERIFY the central junction box (CJB) fuse 6 (15A) is OK. If OK, REFER to EXTERIOR LIGHTING to continue diagnosis of the exterior lamps.

  2. A2 CHECK THE HEADLAMP SWITCH 
    • Place the headlamp switch in the OFF position.
    • Disconnect: Headlamp Switch C205a, C205b.
    • Carry out the headlamp switch component test. Refer to COMPONENT TESTING for component testing.
    • Is the headlamp switch OK? 

    Yes:  GO to  A3.

    No:  INSTALL a new headlamp switch. REFER to REMOVAL AND INSTALLATION . TEST the system for normal operation.

  3. A3 CHECK CIRCUIT 14 (BN) FOR VOLTAGE 
    • Connect: Headlamp Switch C205a.
    • Turn the headlamp switch to the parking lamps ON position.
    • Measure the voltage between the headlamp switch C205b-6, circuit 14 (BN), harness side and ground.
      Fig 1: Checking Circuit 14 (BN) For Voltage
      G04629576Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 

    Yes:  GO to  A4.

    No:  REPAIR the circuit. TEST the system for normal operation.

  4. A4 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
    • Turn the headlamp switch OFF.
    • Measure the resistance between the headlamp switch C205b-4, circuit 57 (BK), harness side and ground.
      Fig 2: Checking Circuit 57 (BK) For Open
      G04629577Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes:  GO to  A5.

    No:  REPAIR the circuit. TEST the system for normal operation.

  5. A5 CHECK THE ILLUMINATION CIRCUIT BETWEEN THE INSTRUMENT CLUSTER AND THE INSTRUMENT PANEL DIMMER SWITCH FOR AN OPEN 
    • Disconnect: Instrument Cluster C220a.
    • For Expedition, measure resistance between the instrument cluster C220a-6, circuit 19 (LB/RD), harness side and the instrument panel dimmer switch D205b-1, circuit 19 (LB/RD), harness side.
      Fig 3: Checking Illumination Circuit Between Instrument Cluster & Instrument Panel Dimmer Switch For Open
      G04629578Courtesy of FORD MOTOR CO.
    • For Navigator, measure the resistance between the instrument cluster C220a-6, circuit 505 (GY/YE), harness side and the instrument panel dimmer switch C205Bb-1, circuit 505 (GY/YE), harness side.
    • Is the resistance less than 5 ohms? 

    Yes:  If Expedition, INSTALL a new instrument panel dimmer switch. REFER to INSTRUMENT PANEL DIMMER SWITCH . TEST the system for normal operation.

    If Navigator, GO to  A6.

    No:  REPAIR the circuit in question. TEST the system for normal operation.

  6. A6 CHECK THE GROUND CIRCUIT TO THE INSTRUMENT CLUSTER 
    • Turn the headlamp switch off.
    • Measure the resistance between the instrument cluster 220a-9, circuit 676 (PK/OG), harness side and ground; and between the instrument cluster C220a-22, circuit 676 (PK/OG), harness side and ground.
      Fig 4: Checking Ground Circuit To Instrument Cluster
      G04629579Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes:  GO to  A7.

    No:  REPAIR the circuit. TEST the system for normal operation.

  7. A7 CHECK THE ILLUMINATION VOLTAGE TO THE INSTRUMENT CLUSTER 
    • Connect: Instrument Panel Dimmer Switch C205b.
    • Turn the headlamp switch to the parking lamps ON position.
    • Rotate the instrument panel dimmer switch to the full illumination position.
    • Measure the voltage between the instrument cluster C220a-6, circuit 505 (GY/YE), harness side and ground.
      Fig 5: Checking Illumination Voltage To Instrument Cluster
      G04629580Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 

    Yes:  GO to  A8.

    No:  INSTALL a new instrument panel dimmer switch. REFER to INSTRUMENT PANEL DIMMER SWITCH . TEST the system for normal operation.

  8. A8 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.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 

    Yes:  INSTALL a new instrument cluster. REFER to REMOVAL AND INSTALLATION . 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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