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Home >> Lincoln >> 2009 >> MKX FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 942 (Instrument Cluster System And Panel Illumination) >> Diagnostic Tests >> Instrument Cluster and Panel Illumination >> Pinpoint Tests >> Pinpoint Test B: The Instrument Cluster Illumination Is Inoperative >> Pinpoint Test B: The Instrument Cluster Illumination Is Inoperative

Pinpoint Test B: The Instrument Cluster Illumination Is Inoperative

WARNING: This page is about a different car, the 2007 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.
  1. B1 CHECK CIRCUIT VLN18 (BU/WH) FOR AN OPEN 
    • Disconnect: Instrument Cluster C220a
    • Place the headlamp switch in the PARKING LAMPS ON position.
    • Rotate the instrument panel dimmer switch to the full illumination position.
      • Fig 1: Measuring Voltage Between Instrument Cluster C220A-11, Circuit VLN18 (BU/WH) & Ground
      GF0010959Courtesy of FORD MOTOR CO.
    • Measure the voltage between the instrument cluster C220a-11, circuit VLN18 (BU/WH), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  B2.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  2. B2 CHECK CIRCUIT GD161 (BK/YE) FOR AN OPEN 
      Fig 2: Measuring Resistance Between Instrument Cluster C220A-1, Circuit GD161 (BK/YE) & Ground
      GF0010960Courtesy of FORD MOTOR CO.
    • Measure the resistance between the instrument cluster C220a-1, circuit GD161 (BK/YE), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  B3.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  3. B3 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION 
    • Disconnect all the instrument cluster connectors.
    • Check for:
      • corrosion
      • damaged pins
      • 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? 
    1. YES  : INSTALL a new instrument cluster. REFER to INSTRUMENT CLUSTER . TEST the system for normal operation.
    2. 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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