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Pinpoint Test E: 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. E1 CHECK THE OTHER DIMMABLE LIGHTING SWITCHES 
    • Ignition OFF.
    • Place the headlamp switch in the PARKING LAMPS ON position.
    • Rotate the instrument panel dimmer switch to the full illumination position and observe the other dimmable switches.
    • Are all the dimmable switches inoperative? 
  2. E2 CHECK FOR VOLTAGE TO THE CLOCKSPRING 
    • Place the headlamp switch in the OFF position.
    • Depower the Supplemental Restraint System (SRS). Refer to GENERAL PROCEDURES
    • Disconnect: Clockspring C2274.
    • Connect: Negative Battery Cable.
    • Ignition ON.
    • 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 clockspring C2274-16, circuit VLN04 (VT/GY), harness side and ground.
      Fig 1: Measuring Voltage Between Clockspring C2274-16, Circuit VLN04 (VT/GY), Harness Side And Ground
      G06260873Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes:  GO to E3  .
    • No:  REPAIR circuit VLN04 (VT/GY) for an open. REPOWER the SRS  . REFER to GENERAL PROCEDURES TEST the system for normal operation.
  3. E3 CHECK FOR VOLTAGE TO THE CLOCKSPRING USING THE CONNECTOR GROUND 
    • Measure the voltage between the clockspring C2274-16, circuit VLN04 (VT/GY), harness side and the clockspring C2274-5, circuit GD116 (BK/VT), harness side.
      Fig 2: Checking Voltage To Clockspring Using Connector Ground
      G06260874Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes:  GO to E4  .
    • No:  REPAIR circuit GD116 (BK/VT) for an open. REPOWER the SRS  . REFER to GENERAL PROCEDURES TEST the system for normal operation.
  4. E4 CHECK THE CLOCKSPRING FOR AN OPEN 
    • Place the headlamp switch in the OFF position.
    • Remove the driver air bag module. Refer to REMOVAL AND INSTALLATION
    • Disconnect: Upper Clockspring Connector.
    • Measure the resistance between the clockspring C2274 pin 5, component side and the upper clockspring connector pin 4, component side.
      Fig 3: Measuring Resistance Between Clockspring C2274 Pin 5 And Upper Clockspring Connector Pin 4, Component Side
      G06260875Courtesy of FORD MOTOR CO.
    • Measure the resistance between the clockspring C2274 pin 16, component side and the upper clockspring connector pin 5, component side.
      Fig 4: Measuring Resistance Between Clockspring C2274 Pin 16 And Upper Clockspring Connector Pin 5, Component Side
      G06403494Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
    • Yes:  GO to E5  .
    • No:  INSTALL a new clockspring. REFER to REMOVAL AND INSTALLATION TEST the system for normal operation.
  5. E5 CHECK THE STEERING WHEEL HARNESS 
    • Inspect the steering wheel harness for opens.
    • Is the steering wheel harness OK? 
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