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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 1621 (Instrument Cluster Illumination And Panel Illumination) >> Diagnostic Tests >> Instrument Cluster & Panel Illumination >> Pinpoint Tests >> Pinpoint Test D: The Steering Wheel Control Switch Illumination Is Inoperative

Pinpoint Test D: The Steering Wheel Control Switch Illumination Is Inoperative

WARNING: This page is about a different car, the 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.

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

Normal Operation 

The lighting control module (LCM) supplies a variable pulse-width modulated (PWM) voltage to the steering wheel control switches through circuit 484 (OG/BK). The steering wheel control switches are grounded through circuit 57 (BK).

This pinpoint test is intended to diagnose the following:

PINPOINT TEST D: THE STEERING WHEEL CONTROL 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.
  1. D1 CHECK THE STEERING WHEEL CONTROL SWITCH 
    • Key in OFF position.
    • Remove the driver air bag module. Refer to REMOVAL AND INSTALLATION article.
    • Disconnect: Inoperative Speed Control Switch
    • 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 Circuits And Ground
      GF0018955Courtesy of FORD MOTOR CO.
    • Measure the voltage between the speed control switch C203-4, circuit 484 (OG/BK), harness side and ground; or between the audio/climate control switch C2208-1, circuit 484 (OG/BK), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  D4.
    2. NO  : Go to  D2.
  2. D2 CHECK THE STEERING WHEEL WIRING HARNESS FOR AN OPEN 
    • Disconnect: Clockspring C218b
      • Fig 2: Checking Steering Wheel Wiring Harness For An Open
      GF0018956Courtesy of FORD MOTOR CO.
    • Measure the voltage between the clockspring C218b pin 4, circuit 484 (OG/BK), component side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : REPAIR or INSTALL a new steering wheel wiring harness. INSTALL the driver air bag module. REFER to REMOVAL AND INSTALLATION article. TEST the system for normal operation.
    2. NO  : Go to  D3.
  3. D3 CHECK CIRCUIT 484 (OG/BK) FOR AN OPEN 
    • Disconnect: Clockspring C218a
      • Fig 3: Checking Circuit For An Open
      GF0014439Courtesy of FORD MOTOR CO.
    • Measure the voltage between the clockspring C218a-12, circuit 484 (OG/BK), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : INSTALL a new clockspring. REFER to REMOVAL AND INSTALLATION article. INSTALL the driver air bag module. REFER to REMOVAL AND INSTALLATION article. TEST the system for normal operation.
    2. NO  : REPAIR the circuit. INSTALL the driver air bag module. REFER to REMOVAL AND INSTALLATION article. TEST the system for normal operation.
  4. D4 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
      Fig 4: Checking Circuit For An Open
      GF0018957Courtesy of FORD MOTOR CO.
    • Measure the resistance between the speed control switch C203-3, circuit 57 (BK), harness side and ground; and between the audio/climate control switch C2208-2, circuit 57 (BK), harness side and ground.
    • Are the resistances less than 5 ohms? 
    1. YES  : INSTALL a new switch in question. INSTALL the driver air bag module. REFER to REMOVAL AND INSTALLATION article. TEST the system for normal operation.
    2. NO  : Go to  D5.
  5. D5 CHECK THE STEERING WHEEL WIRING HARNESS GROUND CIRCUIT(S) FOR AN OPEN 
    • Disconnect: Clockspring C218b
      • Fig 5: Checking Steering Wheel Wiring Harness Ground Circuit(s) For An Open
      GF0018958Courtesy of FORD MOTOR CO.
    • Measure the resistance between the clockspring C218b pin 7, circuit 57 (BK), component side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : REPAIR or INSTALL a new steering wheel wiring harness. INSTALL the driver air bag module. REFER to REMOVAL AND INSTALLATION article. TEST the system for normal operation.
    2. NO  : Go to  D6.
  6. D6 CHECK THE CLOCKSPRING FOR AN OPEN 
    • Disconnect: Clockspring C218a
      • Fig 6: Checking Circuit For Open
      GF0014443Courtesy of FORD MOTOR CO.
    • Measure the resistance between the clockspring C218a-15, circuit 57 (BK), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new clockspring. REFER to REMOVAL AND INSTALLATION article. INSTALL the driver air bag module. REFER to REMOVAL AND INSTALLATION article. TEST the system for normal operation.
    2. NO  : REPAIR the circuit. INSTALL the driver air bag module. REFER to REMOVAL AND INSTALLATION article. TEST the system for normal operation.
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