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Pinpoint Test B: The Auxiliary Climate Control Illumination Is Inoperative (If Equipped)

CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. B1 CHECK CIRCUIT CLN04 (BU/BN) FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: Auxiliary Climate Control C951b
    • Place the headlamp switch in the PARKING LAMPS ON position.
    • Rotate the instrument panel dimmer switch to the full illumination position.
    • Measure the voltage between the auxiliary climate control C951b-6, circuit CLN04 (BU/BN), harness side and ground.
      • Fig 1: Checking Circuit CLN04 (BU/BN) For Voltage
      GF0027960Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  B2.
    2. NO  : REPAIR the circuit for an open. TEST the system for normal operation.
  2. B2 CHECK CIRCUIT GD149 (BK/GY) FOR AN OPEN 
    • Measure the resistance between the auxiliary climate control C951b-9, circuit GD149 (BK/GY), harness side and ground.
      • Fig 2: Checking Circuit GD149 (BK/GY) For Open
      GF0027961Courtesy of FORD MOTOR CO.
    • Measure the resistance between the auxiliary climate control C951a-1, circuit GD149 (BK/GY), harness side and ground.
      • Fig 3: Measuring Resistance
      GF0045256Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    1. YES  : INSTALL a new auxiliary climate control. REFER to AUXILIARY CLIMATE CONTROL article. TEST the system for normal operation.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
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