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Home >> Ford >> 2012 >> Mustang Base, 2D Coupe, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 455 (Instrument Cluster Illumination And Panel Illumination) >> Diagnosis And Testing >> Instrument Cluster and Panel Illumination >> Pinpoint Tests >> Pinpoint Test E: The Steering Wheel Switch Illumination Is Inoperative >> Pinpoint Test E: The Steering Wheel Switch Illumination Is Inoperative

Pinpoint Test E: The Steering Wheel Switch Illumination Is Inoperative

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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 ON.
    • 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 SUPPLEMENTAL RESTRAINT SYSTEM .
    • Disconnect: Clockspring C2274A.
    • 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 C2274A-16, circuit VLN04 (VT/GY), harness side and ground.
      Fig 1: Measuring Voltage Between Clockspring C2274A-16, Circuit VLN04 (VT/GY) 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 SUPPLEMENTAL RESTRAINT SYSTEM . TEST the system for normal operation.
  3. E3 CHECK FOR VOLTAGE TO THE CLOCKSPRING USING THE CONNECTOR GROUND 
    • Measure the voltage between the clockspring C2274A-16, circuit VLN04 (VT/GY), harness side and the clockspring C2274A-5, circuit GD116 (BK/VT), harness side.
      Fig 2: Measuring Voltage Between Clockspring C2274A-16, Circuit VLN04 (VT/GY) And Clockspring C2274A-5
      G06260874Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to E4.
    • No  : REPAIR circuit GD116 (BK/VT). REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . TEST the system for normal operation.
  4. E4 CHECK THE CLOCKSPRING FOR AN OPEN 
    • Ignition OFF.
    • Remove the driver air bag module. REFER to SUPPLEMENTAL RESTRAINT SYSTEM .
    • Disconnect: C2274B.
    • Measure the resistance between the lower clockspring, component side pin 5 and the upper clockspring, component side pin 4.
      Fig 3: Measuring Resistance Between Lower Clockspring, Component Side Pin 5 And Upper Clockspring
      G08645840Courtesy of FORD MOTOR CO.
    • Measure the resistance between the lower clockspring, component side pin 16 and the upper clockspring, component side pin 7.
      Fig 4: Measuring Resistance Between Lower Clockspring, Component Side Pin 16 And Upper Clockspring, Component Side Pin 7
      G08645841Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms? 
  5. E5 CHECK FOR VOLTAGE TO THE INOPERATIVE STEERING WHEEL ILLUMINATION SOURCE USING THE CONNECTOR GROUND 
    • Connect: Clockspring C2274A.
    • Connect: Clockspring C2274B.
    • Disconnect: Steering Wheel Switch C2298 (LH) or C2999 (RH).
    • Ignition ON.
    • Measure the voltage between C2298-8 and C2298-6 (LH) or C2999-8 and C2999-6 (RH).
      Fig 5: Measuring Voltage Between C2298-8 And C2298-6 (LH) Or C2999-8 And C2999-6 (RH)
      G08645842Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : INSTALL a new steering wheel switch. REFER to STEERING COLUMN SWITCHES . INSTALL the driver airbag module. REFER to SUPPLEMENTAL RESTRAINT SYSTEM . TEST the system for normal operation.
    • No  : REPAIR the steering wheel harness. If the steering wheel harness cannot be repaired, INSTALL a new steering wheel. REFER to STEERING COLUMN . TEST the system for normal operation.
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