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Home >> Jaguar >> 2003 >> XJ8 Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 193 (Speed Control) >> Speed Control (4.2L) >> Speed Control - Diagnostic Procedures >> Pinpoint Tests >> Pinpoint Test A: SPEED CONTROL SWITCH CIRCUIT TESTS

Pinpoint Test A: SPEED CONTROL SWITCH CIRCUIT TESTS

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2009 Jaguar XKR, 2009 Jaguar XK8, 2008 Jaguar XKR, 2008 Jaguar XK8, and 2007 Jaguar XKR. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: To avoid accidental deployment and possible personal injury, the back-up power supply must be depleted before repairing or replacing any supplemental restraint system (SRS) components. To deplete the back-up power supply energy, disconnect the battery GROUND cable and wait two minutes. Failure to follow this instruction may result in personal injury.
  1. CHECK THE STEERING WHEEL SPEED CONTROL SWITCH FOR OPEN CIRCUIT 

    Disconnect the battery negative terminal. Refer to Battery .

    Wait two minutes for the system to become safe.

    Disconnect the speed control switch connector SW009.

      Measure the resistance between:

    • speed control switch connector SW009, pin 02, component side
    • speed control switch connector SW009, pin 03, component side

    Measure the resistance between:

  2. speed control switch connector SW009, pin 02, component side
  3. speed control switch connector SW009, pin 03, component side

    Is the resistance 4310 ohms? 

    YES:  Go to step  4.

    NO:  INSTALL a new speed control switch assembly. See Speed Control Switch . TEST the system for normal operation.

  4. CHECK THE STEERING WHEEL SPEED CONTROL RESUME SWITCH CIRCUIT 

      Measure the resistance between:

    • speed control switch connector SW009, pin 02, component side
    • speed control switch connector SW009, pin 03, component side

    Measure the resistance between:

  5. speed control switch connector SW009, pin 02, component side
  6. speed control switch connector SW009, pin 03, component side

    Operate the RESUME  switch.

    Does the resistance switch between 4310 ohms and 2110 ohms when the switch is operated? 

    YES:  Go to step  7.

    NO:  INSTALL a new speed control switch assembly. See Speed Control Switch . TEST the system for normal operation.

  7. CHECK THE STEERING WHEEL SPEED CONTROL SET+ SWITCH CIRCUIT 

      Measure the resistance between:

    • speed control switch connector SW009, pin 02, component side
    • speed control switch connector SW009, pin 03, component side

    Measure the resistance between:

  8. speed control switch connector SW009, pin 02, component side
  9. speed control switch connector SW009, pin 03, component side

    Operate the SET+  switch.

    Does the resistance switch between 4310 ohms and 1110 ohms when the switch is operated? 

    YES:  Go to step  10.

    NO:  INSTALL a new speed control switch assembly. See Speed Control Switch . TEST the system for normal operation.

  10. CHECK THE STEERING WHEEL SPEED CONTROL HEADWAY REDUCTION SWITCH CIRCUIT 

      Measure the resistance between:

    • speed control switch connector SW009, pin 02, component side
    • speed control switch connector SW009, pin 03, component side

    Measure the resistance between:

  11. speed control switch connector SW009, pin 02, component side
  12. speed control switch connector SW009, pin 03, component side

    Operate the HEADWAY REDUCTION  switch.

    Does the resistance switch between 4310 ohms and 600 ohms when the switch is operated? 

    YES:  Go to step  13.

    NO:  INSTALL a new speed control switch assembly. See Speed Control Switch . TEST the system for normal operation.

  13. CHECK THE STEERING WHEEL SPEED CONTROL HEADWAY INCREASE SWITCH CIRCUIT 

      Measure the resistance between:

    • speed control switch connector SW009, pin 02, component side
    • speed control switch connector SW009, pin 03, component side

    Measure the resistance between:

  14. speed control switch connector SW009, pin 02, component side
  15. speed control switch connector SW009, pin 03, component side

    Operate the HEADWAY INCREASE  switch.

    Does the resistance switch between 4310 ohms and 300 ohms when the switch is operated? 

    YES:  Go to step  16.

    NO:  INSTALL a new speed control switch assembly. See Speed Control Switch . TEST the system for normal operation.

  16. CHECK THE STEERING WHEEL SPEED CONTROL SET- SWITCH CIRCUIT 

      Measure the resistance between:

    • speed control switch connector SW009, pin 02, component side
    • speed control switch connector SW009, pin 03, component side

    Measure the resistance between:

  17. speed control switch connector SW009, pin 02, component side
  18. speed control switch connector SW009, pin 03, component side

    Operate the SET-  switch.

    Does the resistance switch between 4310 ohms and 120 ohms when the switch is operated? 

    YES:  Go to step  19.

    NO:  INSTALL a new speed control switch assembly. See Speed Control Switch . TEST the system for normal operation.

  19. CHECK THE STEERING WHEEL SPEED CONTROL CANCEL SWITCH CIRCUIT 

      Measure the resistance between:

    • speed control switch connector SW009, pin 02, component side
    • speed control switch connector SW009, pin 03, component side

    Measure the resistance between:

  20. speed control switch connector SW009, pin 02, component side
  21. speed control switch connector SW009, pin 03, component side

    Operate the CANCEL  switch.

    Does the resistance switch between 4310 ohms and zero ohms when the switch is operated? 

    YES:  Go to step  22.

    NO:  INSTALL a new speed control switch assembly. See Speed Control Switch . TEST the system for normal operation.

  22. CHECK THE STEERING WHEEL SPEED CONTROL SWITCH CIRCUIT FOR OPEN CIRCUIT 

      Measure the resistance between:

    • speed control switch connector SW009, pin 02, harness side
    • steering wheel audio control switch connector SW004, pin 02, harness side

    Measure the resistance between:

  23. speed control switch connector SW009, pin 02, harness side
  24. steering wheel audio control switch connector SW004, pin 02, harness side

    Is the resistance greater than 5 ohms? 

    YES:  REPAIR the circuit speed control switch connector SW009, pin 02 to clockspring connector SW004, pin 02. For additional information, refer to the appropriate SYSTEM WIRING DIAGRAMS article. TEST the system for normal operation.

    NO:  Go to step  25.

  25. CHECK THE STEERING WHEEL SPEED CONTROL SWITCH FOR OPEN CIRCUIT 

      Measure the resistance between:

    • speed control switch connector SW009, pin 03, harness side
    • steering wheel audio control switch connector SW004, pin 03, harness side

    Measure the resistance between:

  26. speed control switch connector SW009, pin 03, harness side
  27. steering wheel audio control switch connector SW004, pin 03, harness side

    Is the resistance greater than 5 ohms? 

    YES:  REPAIR the circuit speed control switch connector SW009, pin 02 to clockspring connector SW004, pin 02. For additional information, refer to the appropriate SYSTEM WIRING DIAGRAMS article. TEST the system for normal operation.

    NO:  No fault has been identified with the speed control switch or circuit, check integrity of connections. Refer to the electrical circuit diagrams and test the LIN circuit between the steering wheel audio switch and the instrument cluster. Test the steering wheel audio switch. Refer to Audio System .

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