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Pinpoint Test D : The Steering Wheel Switch Illumination Is Inoperative

  1. D1 CHECK OTHER NON-NETWORK DIMMABLE LIGHTING SOURCES

    • Ignition OFF.
    • Place the headlamp switch in the parking lamps ON position.
    • Using the instrument panel dimmer switch, change the dimmable backlighting to its brightest setting.

    Are all non-networked dimmable backlighting sources inoperative? 

    Yes  GO to Pinpoint Test B .
    No  If all steering wheel switches do not illuminate, GO to  D2.
    If an individual steering wheel switch does not illuminate, GO to  D5.

  2. D2 CHECK THE HORN OPERATION

    • Push the driver air bag against the steering wheel to activate the horn.

    Does the horn sound? 

    Yes  GO to  D3.
    No  REFER to Horn .

  3. D3 CHECK THE STEERING WHEEL BACKLIGHTING VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

    • Disconnect: Lower Clockspring C218A .
    • Ignition ON.
    • Measure the voltage  between:
      Positive Lead Negative Lead
      Pin Circuit Pin Circuit
      C218A-9 VLN04 (VT/GY) - Ground

    1. GFD94591Courtesy of FORD MOTOR COMPANY

    Is the voltage greater than 11 volts? 

    Yes  GO to  D4.
    No  REPAIR the circuit.

  4. D4 CHECK THE STEERING WHEEL HARNESS

    • Connect: Lower Clockspring C218A .
    • Remove the driver air bag module. Refer to Supplemental Restraint System .
    • Disconnect: Upper Clockspring C218B .
    • Connect: Battery Ground Cable.
    • Place the headlamp switch in the parking lamps ON position.
    • Using the instrument panel dimmer switch, change the dimmable backlighting to its brightest setting.
    • Measure the component side voltage  between:
      Positive Lead Negative Lead
      Pin Circuit Pin Circuit
      C218B-9 VLN04 - Ground

    1. GFD94592Courtesy of FORD MOTOR COMPANY

    Is the voltage greater than 11 volts? 

    Yes  REPAIR the steering wheel harness for an open. If the harness cannot be repaired, INSTALL a new steering wheel. REFER to Steering Column .
    No  INSTALL a new clockspring. REFER to Supplemental Restraint System .

  5. D5 CHECK THE SUSPECT STEERING WHEEL SWITCH FOR VOLTAGE

    • Remove the driver air bag module. Refer to Supplemental Restraint System .
    • Disconnect: LH Steering Wheel Switch C2998 or RH Steering Wheel Switch C2999 .
    • Connect: Battery Ground Cable.
    • Place the headlamp switch in the parking lamps ON position.
    • Using the instrument panel dimmer switch, change the dimmable backlighting to its brightest setting.
    • Measure the voltage  between:
      Positive Lead Negative Lead
      Pin Circuit Pin Circuit
      LH Steering Wheel Switch 
      C2998-10 VLN04 C2998-5 RRH02
      RH Steering Wheel Switch 
      C2999-6 VLN04 C2999-1 RRH02

    1. GFD94593Courtesy of FORD MOTOR COMPANY

    Is the voltage greater than 11 volts? 

    Yes  INSTALL a new LH or RH steering wheel switch. REFER to Steering Column Switches .
    No  REPAIR the steering wheel harness for an open. If the harness cannot be repaired, INSTALL a new steering wheel. REFER to Steering Column .
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