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Pinpoint Test B: The Instrument Cluster Illumination Is Inoperative

WARNING: This page is about a different car, the 2004 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
  1. B1 CHECK FOR POWER TO THE INSTRUMENT CLUSTER 
    • Disconnect: Instrument Cluster C220a.
    • Place the headlamp switch in the PARK position.
    • Rotate the instrument panel dimmer switch to the full illumination position.
    • Measure the voltage between the instrument cluster C220a pin 11, circuit 19 (LB/RD), harness side and ground.
      Fig 1: Checking For Power To Instrument Cluster
      G03277004Courtesy of FORD MOTOR CO.
    • 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 THE INSTRUMENT CLUSTER GROUND 
    • Measure the resistance between the instrument cluster C220a pin 1, circuit 57 (BK), harness side and ground.
      Fig 2: Checking Instrument Cluster Ground
      G03277005Courtesy of FORD MOTOR CO.
    • 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 instrument cluster connectors.
    • Check for:
      • Corrosion
      • Pushed-out pins
    • Connect all 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. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. TEST the system for normal operation.
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