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Pinpoint Test D: The Steering Wheel Switch Illumination Is Inoperative

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. D1 CHECK THE OTHER DIMMABLE LIGHTING SWITCHES 
    • Ignition OFF.
    • Place the headlamp switch in the PARKING LAMPS ON position.
    • Press and hold the instrument panel dimmer switch up to the full illumination position and observe other dimmable switches.
    • Are all the dimmable switches inoperative? 
  2. D2 CHECK THE HORN OPERATION 
    • Press the driver air bag module against the steering wheel.
    • Does the horn sound? 
      • Yes  : GO to  D3.
      • No  : REFER to HORN to diagnose the horn is inoperative.
  3. D3 CHECK FOR VOLTAGE TO THE CLOCKSPRING 
    • Place the headlamp switch in the OFF position.
    • Disconnect: Clockspring C218B.
    • Place the headlamp switch in the PARKING LAMPS ON position.
    • Press and hold the instrument panel dimmer switch up to the full illumination position.
    • Measure the voltage between the clockspring C218B-13, circuit CLN04 (BU/BN), harness side and ground.
      Fig 1: Measuring Voltage Between Clockspring C218B-13, Circuit CLN04 (BU/BN), Harness Side And Ground
      G06937349Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
      • Yes  : GO to  D4.
      • No  : REPAIR circuit CLN04 (BU/BN) for an open. TEST the system for normal operation.
  4. D4 CHECK THE GROUND CIRCUIT TO THE CLOCKSPRING FOR CONTINUITY 
    • Measure the voltage between the clockspring C218B-13, circuit CLN04 (BU/BN), harness side and the clockspring C218B-15, circuit GD115 (BK/GY), harness side.
      Fig 2: Measuring Voltage Between Clockspring C218B-13, Circuit CLN04 (BU/BN) And Clockspring C218B-15, Circuit GD115 (BK/GY)
      G06937350Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
      • Yes  : GO to  D5.
      • No  : REPAIR circuit GD115 (BK/GY) for an open. TEST the system for normal operation.
  5. D5 CHECK FOR VOLTAGE TO THE STEERING WHEEL SWITCH 
    • Connect: Clockspring C218B.
    • Place the headlamp switch in the OFF position.
    • Remove the driver air bag module. Refer to SUPPLEMENTAL RESTRAINT SYSTEM .
    • Disconnect: Inoperative Steering Wheel Switch.
    • Place the headlamp switch in the PARKING LAMPS ON position.
    • For the cruise control switch, measure the voltage between the cruise control switch C2999-3, harness side and the cruise control switch C2999-1, harness side.
    • For the steering wheel controls switch, measure the voltage between the steering wheel controls switch C2998-3, harness side and the steering wheel controls switch C2998-1, harness side.
      Fig 3: Measuring Voltage Between Steering Wheel Controls Switch C2998-3 And Steering Wheel Controls Switch C2998-1
      G06937351Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
  6. D6 CHECK FOR VOLTAGE TO THE UPPER CLOCKSPRING 
    • Disconnect: Clockspring C218C.
    • Measure the voltage between the clockspring C218C-6, component side and the clockspring C218C-8, component side.
      Fig 4: Measuring Voltage Between Clockspring C218C-6, Component Side And Clockspring C218C-8, Component Side
      G06937352Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
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