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Pinpoint Test D: The Steering Wheel Control Illumination Is Inoperative

Refer to appropriate SYSTEM WIRING DIAGRAM article for Cluster and Panel Illumination schematic and connector information.

Normal Operation 

The smart junction box (SJB) sends a pulse width modulated (PWM) voltage to the steering wheel controls through circuit VLN04 (VT/GY) (Edge) or circuit VLN37 (BU/WH) (MKX) to the clockspring. The voltage passes through the clockspring to the steering wheel control switches. Ground to the clockspring is supplied through circuit GD116 (BK/VT).

This pinpoint test is intended to diagnose the following:

PINPOINT TEST D: THE STEERING WHEEL CONTROL ILLUMINATION IS INOPERATIVE 

CAUTION: 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 
    • Key in OFF position.
    • 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 (door lock switches, hazard lamp switch, headlamp switch for example).
    • Are all the dimmable switches inoperative? 
    1. YES  : Go to Pinpoint Test A .
    2. NO  : Go to  D2.
  2. D2 CHECK CIRCUIT VLN04 (VT/GY) (EDGE) OR CIRCUIT VLN37 (BU/WH) (MKX) FOR AN OPEN 
    • Place the headlamp switch in the OFF position.
    • Depower the supplemental restraint system (SRS). Refer to SUPPLEMENTAL RESTRAINT SYSTEM article.
    • Disconnect: Clockspring C218a
    • Connect the battery ground cable.
    • Place the headlamp switch in the PARKING LAMPS ON position.
    • Rotate the instrument panel dimmer switch to the full illumination position.
      • Fig 1: Measuring Voltage Between Clockspring C218A-16, Circuit VLN04 (VT/GY) (Edge) Or Circuit VLN37 (BU/WH) (MKX)
      GF0023326Courtesy of FORD MOTOR CO.
    • Measure the voltage between the clockspring C218a-16, circuit VLN04 (VT/GY) (Edge) or circuit VLN37 (BU/WH) (MKX), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : TURN the parking lamps off. Go to  D3.
    2. NO  : REPAIR the circuit. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article. TEST the system for normal operation.
  3. D3 CHECK CIRCUIT GD116 (BK/VT) FOR AN OPEN 
      Fig 2: Measuring Resistance Between Clockspring C218A-7, Circuit GD116 (BK/VT) & Ground
      GF0030360Courtesy of FORD MOTOR CO.
    • Measure the resistance between the clockspring C218a-7, circuit GD116 (BK/VT), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  D4.
    2. NO  : REPAIR the circuit. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article. TEST the system for normal operation.
  4. D4 CHECK THE CLOCKSPRING FOR AN OPEN 
    • Remove the driver air bag module. Refer to SUPPLEMENTAL RESTRAINT SYSTEM article.
    • Disconnect: Upper Clockspring Connector C218b
      • Fig 3: Measuring Resistance Between Clockspring C218A Pin 16 And Upper Clockspring C218B Pin 7
      GF0044361Courtesy of FORD MOTOR CO.
    • Measure the resistance between the clockspring C218a pin 16, component side and the upper clockspring C218b pin 7, component side.
      • Fig 4: Measuring Resistance Between Clockspring C218A Pin 7 And Upper Clockspring C218B Pin 2
      GF0044362Courtesy of FORD MOTOR CO.
    • Measure the resistance between the clockspring C218a pin 7, component side and the upper clockspring C218b pin 2, component side.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  D5.
    2. NO  : INSTALL a new clockspring. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article. INSTALL the driver air bag module. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article. TEST the system for normal operation.
  5. D5 CHECK THE STEERING WHEEL HARNESS CIRCUIT VLN04 (VT/GY) (EDGE) OR CIRCUIT VLN37 (BU/WH) (MKX) FOR AN OPEN 
    • Disconnect: LH Steering Wheel Switches C2998
    • Disconnect: RH Steering Wheel Switches C2999
      • Fig 5: Measuring Resistance Between Upper Clockspring Connector C218B-7, Circuit VLN04 (VT/GY) & LH Steering Wheel Switches C2998-2
      GF0032207Courtesy of FORD MOTOR CO.
    • 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.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  D6.
    2. NO  : REPAIR the circuit in question. INSTALL the driver air bag module. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article. TEST the system for normal operation.
  6. D6 CHECK CIRCUIT GD165 (BK) FOR AN OPEN 
      Fig 6: Measuring Resistance Between Clockspring C218B-2, Circuit GD165 (BK) & LH Steering Wheel Switch C2998-4
      GF0032208Courtesy of FORD MOTOR CO.
    • 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 GD165 (BK), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new speed control switch or steering wheel controls as necessary. REFER to SPEED CONTROL article or INFORMATION AND ENTERTAINMENT SYSTEMS article. INSTALL the driver air bag module. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article. TEST the system for normal operation.
    2. NO  : REPAIR the circuit. INSTALL the driver air bag module. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article. TEST the system for normal operation.
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