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.

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 other dimmable switches.
- Are all the dimmable switches inoperative?
- Yes: GO to PINPOINT TEST C .
- No: GO to E2 .
E2 CHECK FOR VOLTAGE TO THE CLOCKSPRING
- Place the headlamp switch in the OFF position.
- Depower the Supplemental Restraint System (SRS). Refer to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING
- Disconnect: Clockspring C218.
- Connect: Negative Battery Cable.
- 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 C218-2, circuit VLN04 (VT/GY), harness side and ground.
  
  Fig 1: Measuring Voltage Between Clockspring C218-2, Circuit VLN04 (VT/GY) And Ground
  Courtesy 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 SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING TEST the system for normal operation.
E3 CHECK FOR VOLTAGE TO THE CLOCKSPRING USING THE CONNECTOR GROUND
- Measure the voltage between the clockspring C218-2, circuit VLN04 (VT/GY), harness side and the clockspring C218-7, circuit GD134 (BK/VT), harness side.
  
  Fig 2: Measuring Voltage Between Clockspring C218-2, Circuit VLN04 (VT/GY) And Clockspring C218-7, Circuit GD134 (BK/VT)
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes: GO to E4 .
- No: REPAIR circuit GD134 (BK/VT) for an open. REPOWER the SRS . REFER to SUPPLEMENTAL RESTRAINT SYSTEM (SRS) DEPOWERING AND REPOWERING TEST the system for normal operation.
E4 CHECK THE CLOCKSPRING FOR AN OPEN
- Remove the driver air bag module. Refer to REMOVAL AND INSTALLATION
- Disconnect: Upper Clockspring.
- Measure the resistance between the clockspring C218 pin 2, component side and the upper clockspring pin 7, component side.
  
  Fig 3: Measuring Resistance Between Clockspring C218 Pin 2, Component Side And Upper Clockspring Pin 7, Component Side
  Courtesy of FORD MOTOR CO.
- Measure the resistance between the clockspring C218 pin 7, component side and the upper clockspring pin 4, component side.
  
  Fig 4: Measuring Resistance Between Clockspring C218 Pin 7, Component Side And Upper Clockspring Pin 4, Component Side
  Courtesy 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.
E5 CHECK THE STEERING WHEEL HARNESS
- Inspect the steering wheel control switch harness for opens.
- Is the steering wheel harness OK?
- Yes: INSTALL a new steering wheel switch(es). REFER to CRUISE CONTROL or INFORMATION AND ENTERTAINMENT SYSTEMS as necessary. INSTALL the driver air bag module. REFER to REMOVAL AND INSTALLATION TEST the system for normal operation.
- No: REPAIR or INSTALL a new steering wheel harness. INSTALL the driver air bag module. REFER to REMOVAL AND INSTALLATION TEST the system for normal operation.