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Home >> Jaguar >> 2014 >> XK Base, 2D Coupe >> Repair and Diagnosis >> External Pages >> Different car >> Section 65 (Speed Control) >> Speed Control (V8 5.0L Petrol/V8 S/C 5.0L Petrol) >> Diagnostic Procedures >> Speed Control >> Pinpoint Tests >> Pinpoint Test B: BRAKE SWITCH CIRCUIT TEST

Pinpoint Test B: BRAKE SWITCH CIRCUIT TEST

WARNING: This page is about a different car, the 2011 Jaguar XKR, 2011 Jaguar XK, 2010 Jaguar XKR, and 2010 Jaguar XK. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK THE BRAKE SWITCH FUNCTION, WITH THE BRAKE PEDAL RELEASED 
    1. Set ignition status to OFF.
    2. Disconnect the brake switch connector CA142.
    3. Measure the resistance between:
      • Brake switch connector CA142, pin 02 component side
      • Brake switch connector CA142, pin 03 component side

    Is the resistance greater than 5 ohms? 

    YES:  INSTALL a new brake switch. TEST the system for normal operation.

    NO:  Go to step  2.

  2. CHECK THE BRAKE SWITCH FUNCTION, WITH THE BRAKE PEDAL DEPRESSED 
    1. Measure the resistance between:
      • Brake switch connector CA142, pin 02 component side
      • Brake switch connector CA142, pin 03 component side

    Is the resistance greater than 10, 000 ohms? 

    YES:  Go to step  3.

    NO:  INSTALL a new brake switch. TEST the system for normal operation.

  3. CHECK THE BRAKE SWITCH GROUND CIRCUIT FOR OPEN CIRCUIT 
    1. Measure the resistance between:
      • Brake switch connector CA142, pin 03
      • GROUND

    Is the resistance greater than 5 ohms? 

    YES:  REPAIR the circuit between the brake switch connector CA142, pin 03 and GROUND. For additional information, refer to the wiring diagrams. TEST the system for normal operation.

    NO:  Go to step  4.

  4. CHECK THE ECM TO BRAKE SWITCH CIRCUIT FOR OPEN CIRCUIT 
    1. Disconnect the ECM connector, FL072.
    2. Measure the resistance between:
      • ECM connector FL072, pin 40
      • Brake switch connector CA142, pin 02

    Is the resistance greater than 5 ohms? 

    YES:  Go to step  5.

    NO:  No fault is indicated with the brake switch or circuit. Check the integrity of all connections and TEST the system for normal operation.

  5. CHECK THE ECM TO BRAKE SWITCH CIRCUIT FOR OPEN CIRCUIT 
    1. Disconnect intermediate electrical connector FL002.
    2. Measure the resistance between:
      • ECM connector FL072, pin 40
      • Intermediate electrical connector FL002, pin 13

    Is the resistance greater than 5 ohms? 

    YES:  REPAIR the circuit between the ECM connector FL072, pin 40 and intermediate electrical connector FL002, pin 13. For additional information, refer to the wiring diagrams. TEST the system for normal operation.

    NO:  Go to step  6.

  6. CHECK THE ECM TO BRAKE SWITCH CIRCUIT FOR OPEN CIRCUIT 
    1. Measure the resistance between:
      • Brake switch connector CA142, pin 02
      • Intermediate electrical connector FL002, pin 13

    Is the resistance greater than 5 ohms? 

    YES:  REPAIR the circuit between the brake switch connector CA142, pin 02 and intermediate electrical connector FL002, pin 13. For additional information, refer to the wiring diagrams. TEST the system for normal operation.

    NO:  No fault is indicated with the brake switch or circuit. Check the integrity of all connections and TEST the system for normal operation.

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