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Home >> Mercury >> 2009 >> Sable Premier, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Cluster Illumination & Instrument Panel Illumination >> Diagnostic Tests >> Instrument Cluster and Panel Illumination >> Pinpoint Tests >> Pinpoint Test D: The Steering Wheel Control Illumination Is Inoperative >> Pinpoint Test D: The Steering Wheel Control Illumination Is Inoperative

Pinpoint Test D: The Steering Wheel Control 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. 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.
    • 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) FOR AN OPEN 
    • Depower the supplemental restraint system (SRS). Refer to SUPPLEMENTAL RESTRAINT SYSTEM article.
    • Disconnect: Clockspring C2274
    • Key in ON position.
    • 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: Checking Circuit For Open
      GF0023326Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : TURN the headlamp switch off. Go to  D3 .
    2. NO  : DISCONNECT the battery ground cable. REPAIR the circuit. REPOWER the SRS. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article. TEST the system for normal operation.
  3. D3 CHECK CIRCUIT GD111 (BK/BU) FOR AN OPEN 
    • Measure the resistance between the clockspring C2274-5, circuit GD112 (BK/GN), harness side and ground.
      • Fig 2: Checking Circuit For Open
      GF0023327Courtesy of FORD MOTOR CO.
    • 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
    • Measure the resistance between the clockspring C2274 pin 5, component side and the upper clockspring connector pin 4, component side; and between the clockspring C2274 pin 16, component side and the upper clockspring connector pin 7, component side.
      • Fig 3: Measuring Resistance
      GF0046077Courtesy of FORD MOTOR CO.
    • 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 CONTROL SWITCH HARNESS 
    • Inspect the steering wheel control switch harness for shorts, opens, or any damage.
    • Is the steering wheel control switch harness OK? 
    1. YES  : INSTALL new steering wheel controls. REFER to SPEED CONTROL article or INFORMATION AND ENTERTAINMENT SYSTEMS article as necessary. INSTALL the driver air bag module. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article. TEST the system for normal operation.
    2. NO  : REPAIR or INSTALL a new steering wheel control switch harness. INSTALL the driver air bag module. REFER to SUPPLEMENTAL RESTRAINT SYSTEM article. TEST the system for normal operation.
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