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Pinpoint Test C: The Climate Control Illumination Is Inoperative

  1. C1 CHECK VOLTAGE TO CLIMATE CONTROL ILLUMINATION 
    • Disconnect: Function Selector Switch C294b.
    • Place the headlamp switch in the ON position.
    • Rotate the instrument panel dimmer switch to the full illumination position.
    • Measure the voltage between the function selector switch C294b pin 2, circuit 19 (LB/RD), harness side and ground.
      Fig 1: Checking Voltage To Climate Control Illumination
      G03242505Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. Yes:  GO to C2.
    2. No:  REPAIR the circuit. TEST the system for normal operation.
  2. C2 CHECK GROUND TO CLIMATE CONTROL 
    • Measure the resistance between the function selector switch C294b pin 1, circuit 1205 (BK), harness side and ground.
      Fig 2: Checking Ground To Climate Control
      G03242506Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. Yes:  INSTALL new illumination bulb(s). REFER to CONTROL COMPONENTS .
    2. No:  REPAIR the circuit. TEST the system for normal operation.
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