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Pinpoint Test A: No Communication With The Instrument Cluster: Testing

WARNING: This page is about a different car, the 2005 Mercury Montego, 2005 Ford Freestyle, and 2005 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.
  1. A1 CHECK THE INSTRUMENT CLUSTER POWER SUPPLY 
    • Disconnect: Instrument Cluster C220.
    • Key in ON position.
    • Measure the voltage between the instrument cluster, harness side and ground as follows:
      DIAGNOSIS PROCEDURE

      Instrument Cluster Connector-Pin Circuit
      C220-1 1566 (RD/YE)
      C220-3 483 (RD)
      C220-5 295 (LB/PK)
    • Are the voltages greater than 10 volts? 
    • Yes  : GO to A2.
    • No  : REPAIR the circuit in question. TEST the system for normal operation.
  2. A2 CHECK THE INSTRUMENT CLUSTER GROUND CIRCUITS 
    • Key in OFF position.
    • Measure the resistance between the instrument cluster, harness side and ground as follows:
      DIAGNOSIS PROCEDURE

      Instrument Cluster Connector-Pin Circuit
      C220-2 1203 (BK/LB)
      C220-4 1205 (BK)
    • Are the resistances less than 5 ohms? 
    • Yes  : REFER to MODULE COMMUNICATIONS NETWORK to continue communication diagnosis.
    • No  : REPAIR the circuit in question. TEST the system for normal operation.
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