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Pinpoint Test C: The Climate Control Illumination Is Inoperative

  1. C1 VERIFY THE CLIMATE CONTROL ILLUMINATION OPERATION 
    • Turn the headlamp switch to the parking lamps ON position.
    • Rotate the instrument panel dimmer switch to the full illumination position.
    • Does the climate control illumination operate correctly? 
    • Yes  : System is OK.
    • No  : If the EATC illumination does not operate correctly, GO to C2.

    If the front auxiliary climate control illumination does not operate correctly, GO to C4.

    If the rear auxiliary climate control illumination does not operate correctly, GO to C6.

    If the manual climate control illumination does not operate correctly, GO to C8.

  2. C2 CHECK THE VOLTAGE TO THE EATC ILLUMINATION 
    • Disconnect: EATC C228a.
      • For Expedition, measure the voltage between the EATC C228a pin 14, circuit 19 (LB/RD), harness side and ground.
      • For Navigator, measure the voltage between the EATC C228a pin 14, circuit 235 (RD/BK), harness side and ground.
      Fig 1: Checking Voltage To EATC Illumination
      G03930673Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to C3.
    • No  : REPAIR the circuit in question. TEST the system for normal operation.
  3. C3 CHECK THE EATC GROUND CIRCUIT 
    • Measure the resistance between the EATC C228a pin 2, circuit 875 (BK/LB), harness side and ground.
      Fig 2: Measuring Resistance Between EATC C228A Pin 2, Circuit 875 (BK/LB), Harness Side And Ground
      G03930674Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : INSTALL a new EATC. REFER to CONTROL COMPONENTS . TEST the system for normal operation.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  4. C4 CHECK THE VOLTAGE TO THE FRONT AUXILIARY CLIMATE CONTROL 
    • Disconnect: Front Auxiliary Climate Control C989b.
    • Measure the voltage between the front auxiliary climate control C989b pin 6, circuit 19 (LB/RD), harness side and ground.
      Fig 3: Measuring Voltage Between Front Auxiliary Climate Control C989B Pin 6, Circuit 19 (LB/RD), Harness Side And Ground
      G03930675Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to C5.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  5. C5 CHECK THE GROUND CIRCUIT TO THE FRONT AUXILIARY CLIMATE CONTROL 
    • Measure the resistance between the front auxiliary climate control C989b pin 9, circuit 57 (BK), harness side and ground.
      Fig 4: Measuring Resistance Between Front Auxiliary Climate Control C989B Pin 9, Circuit 57 (BK), Harness Side And Ground
      G03930676Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : INSTALL a new front auxiliary climate control assembly. REFER to CONTROL COMPONENTS . TEST the system for normal operation.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  6. C6 CHECK THE VOLTAGE TO THE REAR AUXILIARY CLIMATE CONTROL 
    • Disconnect: Rear Auxiliary Climate Control C3198b.
      • For Expedition, measure the voltage between the rear auxiliary climate control C3198b pin 6, circuit 19 (LB/RD), harness side and ground.
      • For Navigator, measure the voltage between the rear auxiliary climate control C3198b pin 6, circuit 1417 (LG/RD), harness side and ground.
      Fig 5: Checking Voltage To Rear Auxiliary Climate Control
      G03930675Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to C7.
    • No  : REPAIR the circuit in question. TEST the system for normal operation.
  7. C7 CHECK THE GROUND CIRCUIT TO THE REAR AUXILIARY CLIMATE CONTROL 
    • Measure the resistance between the rear auxiliary climate control C3198b pin 9, circuit 57 (BK), harness side and ground.
      Fig 6: Measuring Resistance Between Rear Auxiliary Climate Control C3198B Pin 9, Circuit 57 (BK), Harness Side And Ground
      G03930676Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : INSTALL a new rear auxiliary climate control assembly. REFER to CONTROL COMPONENTS . TEST the system for normal operation.
    • No  : REPAIR circuit 57 (BK). TEST the system for normal operation.
  8. C8 CHECK THE VOLTAGE TO THE MANUAL CLIMATE CONTROL 
    • Disconnect: Function Selector Switch C294c.
    • Measure the voltage between the function selector switch C294c pin 10, circuit 19 (LB/RD), harness side and ground.
      Fig 7: Measuring Voltage Between Function Selector Switch C294C Pin 10, Circuit 19 (LB/RD), Harness Side And Ground
      G03930679Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to C9.
    • No  : REPAIR circuit 19 (LB/RD). TEST the system for normal operation.
  9. C9 CHECK THE GROUND CIRCUIT TO THE MANUAL CLIMATE CONTROL 
    • Measure the resistance between the function selector switch C294c pin 6, circuit 57 (BK), harness side and ground.
      Fig 8: Measuring Resistance Between Function Selector Switch C294C Pin 6, Circuit 57 (BK), Harness Side And Ground
      G03930680Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : INSTALL a new manual climate control assembly. REFER to CONTROL COMPONENTS . TEST the system for normal operation.
    • No  : REPAIR circuit 57 (BK). TEST the system for normal operation.
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