Jaguar XJ (X350). Manual — part 879

G531330t103 : CHECK THE OPERATION OF THE BRAKE SWITCH (PEDAL
RELEASED)

1. Key off. 2. Disconnect the brake switch electrical connector, CR78. 3. Make sure the brake pedal is

not pressed. 4. Measure the resistance between:

Brake switch connector CR78, component side Brake switch connector CR78, component side

Pin 01

Pin 02

Is the resistance greater than 10 ohms?

-> Yes

GO to Pinpoint Test G531330t104.

-> No

INSTALL a new brake switch. CLEAR the DTC, test the system for normal operation.

G531330t104 : CHECK THE OPERATION OF THE BRAKE SWITCH (PEDAL
PRESSED)

1. Press the brake pedal. 2. Measure the resistance between:

Brake switch connector CR78, component side Brake switch connector CR78, component side

Pin 01

Pin 02

Is the resistance greater than 10 ohms?

-> Yes

INSTALL a new brake switch. CLEAR the DTC, test the system for normal operation.

-> No

GO to Pinpoint Test G531330t105.

G531330t105 : CHECK THE POWER SUPPLY TO THE BRAKE PEDAL SWITCH

1. Key on, engine off. 2. Measure the voltage between:

Brake switch connector CR78, harness side

Battery

Pin 01

Negative terminal

Is the voltage less than 10 volts?

-> Yes

REPAIR the circuit between the brake switch and battery. This circuit includes fuse 44 of the primary

junction box. For additional information, refer to the wiring diagrams. CLEAR the DTC, test the

system for normal operation.

-> No

GO to Pinpoint Test G531330t106.

G531330t106 : CHECK THE BRAKE SWITCH SIGNAL CIRCUIT FOR SHORT
CIRCUIT TO GROUND

1. Key off. 2. Measure the resistance between:

Brake switch connector CR78, harness side

Battery

Pin 02

Negative terminal

Is the resistance less than 10,000 ohms?

-> Yes

REPAIR the short circuit. For additional information, refer to the wiring diagrams. CLEAR the DTC, test

the system for normal operation.

-> No

GO to Pinpoint Test G531330t112.

G531330t112 : CHECK THE BRAKE SWITCH SIGNAL CIRCUIT FOR SHORT
CIRCUIT TO POWER

1. Measure the resistance between:

Brake switch connector CR78, harness side

Battery

Pin 02

Positive terminal

Is the resistance less than 10,000 ohms?

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-> Yes

REPAIR the short circuit. For additional information, refer to the wiring diagrams. CLEAR the DTC, test

the system for normal operation.

-> No

GO to Pinpoint Test G531330t113.

G531330t113 : CHECK THE BRAKE SWITCH SIGNAL CIRCUIT FOR HIGH
RESISTANCE

1. Disconnect the ECM electrical connector, EC300. 2. Measure the resistance between:

Brake switch connector CR78, harness side ECM connector EC300, harness side

Pin 02

Pin 41

Is the resistance greater than 5 ohms?

-> Yes

REPAIR the high resistance circuit. For additional information, refer to the wiring diagrams. CLEAR the

DTC, test the system for normal operation.

-> No

REFER to the warranty policy and procedures manual if an ECM is suspect.

Removal and installation

Brake Pedal Position (BPP) Switch

Removal

1 . Switch the ignition on.

2 . Position the front seat fully rearwards.

3 . Switch the ignition off.

4 . Remove the driver's side footwell trim panel.

Release the 3 clips.

5 . Release the brake pedal position (BPP) switch.

Rotate the BPP switch 45 degrees counter-clockwise.

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