Pinpoint Test B: The Steering Wheel Control Illumination Is Inoperative

B1 CHECK CIRCUIT VLN04 (VT/GY) FOR AN OPEN
- Depower the supplemental restraint system (SRS). Refer to SUPPLEMENTAL RESTRAINT SYSTEM .
- Disconnect: Clockspring C218a.
- Key in ON position.
- With the parking lamps ON, rotate the instrument panel dimmer switch to the full illumination position.
- Measure the voltage between the clockspring C218a-16, circuit VLN04 (VT/GY), harness side and ground.
  
  Fig 1: Identifying Circuit VLN04 (VT/GY) For Open
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
Yes : TURN the parking lamps OFF. GO to B2.

No : REPAIR the circuit. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . TEST the system for normal operation.
B2 CHECK CIRCUIT GD116 (BK/VT) FOR AN OPEN
- Measure the resistance between the clockspring C218a-7, circuit GD116 (BK/VT), harness side and ground.
  
  Fig 2: Checking Circuit GD116 (BK/VT) For Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes : GO to B3.

No : REPAIR the circuit. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . TEST the system for normal operation.
B3 CHECK THE CLOCKSPRING FOR AN OPEN
- Remove the driver air bag module. Refer to SUPPLEMENTAL RESTRAINT SYSTEM .
- Disconnect: Upper Clockspring Connector C218b.
- Measure the resistance between the clockspring C218a pin 16, component side and the upper clockspring connector C218b pin 7, component side; and between the clockspring C218a pin 7, component side and the upper clockspring connector C218b pin 2, component side.
  
  Fig 3: Checking Clockspring For Open
  Courtesy of FORD MOTOR CO.
- Are the resistances less than 5 ohms?
Yes : GO to B4.

No : INSTALL a new clockspring. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . INSTALL the driver air bag module. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . TEST the system for normal operation.
B4 CHECK STEERING WHEEL HARNESS CIRCUIT VLN04 (VT/GY) FOR AN OPEN
- Disconnect: LH Steering Wheel Switches C2998.
- Disconnect: RH Steering Wheel Switches C2999.
- Measure the resistance between the upper clockspring connector C218b-7, circuit VLN04 (VT/GY), harness side and the LH steering wheel switches C2998-2, circuit VLN04 (VT/GY), harness side; and between the upper clockspring connector C218b-7, circuit VLN04 (VT/GY), harness side and the RH steering wheel switches C2999-1, circuit VLN04 (VT/GY), harness side.
  
  Fig 4: Checking Steering Wheel Harness Circuit VLN04 (VT/GY) For Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes : GO to B5.

No : REPAIR the circuit. INSTALL the driver air bag module. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . TEST the system for normal operation.
B5 CHECK CIRCUIT GD165 (BK) FOR AN OPEN
- Measure the resistance between the clockspring C218b-2, circuit GD165 (BK), harness side, and the LH steering wheel switch C2998-4, circuit GD165 (BK), harness side; and between the clockspring C218b-2, circuit GD165 (BK), harness side, and the RH steering wheel switch C2999-3, circuit GD116 (BK), harness side.
  
  Fig 5: Checking Circuit GD165 (BK) For Open
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
Yes : INSTALL new speed control switch or audio steering wheel controls as necessary. REFER to SPEED CONTROL or ENTERTAINMENT SYSTEM - GENERAL INFORMATION as necessary. INSTALL the driver air bag module. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . TEST the system for normal operation.

No : REPAIR the circuit. INSTALL the driver air bag module. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . TEST the system for normal operation.