Jaguar XJ (X350). Manual — part 1183

PINPOINT TEST G532451p10 : BRAKE
CANCEL SWITCH CIRCUIT TEST
(PETROL VEHICLES)

G532451t38 : CHECK THE BRAKE CANCEL SWITCH FUNCTION, WITH THE
BRAKE PEDAL RELEASED

1. Turn the ignition switch to the OFF position. 2. Disconnect the brake cancel switch connector

CR77. 3. Measure the resistance between the brake cancel switch connector CR77, pin 01

component side and the brake cancel switch connector CR77, pin 02 component side.

Is the resistance greater than 5 ohms?

-> Yes

INSTALL a new brake cancel switch.

Speed Control Deactivator Switch (19.75.20) TEST the system for normal operation.

-> No

GO to Pinpoint Test G532451t39.

G532451t39 : CHECK THE BRAKE CANCEL SWITCH FUNCTION, WITH THE
BRAKE PEDAL DEPRESSED

1. Measure the resistance between the brake cancel switch connector CR77, pin 01 component side

and the brake cancel switch connector CR77, pin 02 component side.

Is the resistance greater than 10,000 ohms?

-> Yes

GO to Pinpoint Test G532451t33.

-> No

INSTALL a new brake cancel switch.

Speed Control Deactivator Switch (19.75.20) TEST the system for normal operation.

G532451t33 : CHECK THE BRAKE CANCEL SWITCH GROUND CIRCUIT FOR
OPEN CIRCUIT

1. Measure the resistance between the brake cancel switch connector CR77, pin 01 (B) and GROUND.

Is the resistance greater than 5 ohms?

-> Yes

REPAIR the circuit between the brake cancel switch connector CR77, pin 01 (B) and GROUND. For

additional information, refer to the wiring diagrams. TEST the system for normal operation.

-> No

GO to Pinpoint Test G532451t34.

G532451t34 : CHECK THE ECM TO BRAKE CANCEL SWITCH CIRCUIT FOR
OPEN CIRCUIT

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

EC300, pin 40 (U) and brake cancel switch connector CR77, pin 02 (U).

Is the resistance greater than 5 ohms?

-> Yes

REPAIR the circuit between the ECM connector EC300, pin 40 (U) and brake cancel switch connector

CR77, pin 02 (U). For additional information, refer to the wiring diagrams. TEST the system for normal

operation.

-> No

No fault is indicated with the brake cancel switch or circuit. To continue the diagnostics, return to the

Symptom Chart.

PINPOINT TEST G532451p11 : BRAKE
CANCEL SWITCH CIRCUIT TEST
(DIESEL VEHICLES)

G532451t37 : CHECK THE BRAKE CANCEL SWITCH OUTPUT VOLTAGE

1. Turn the ignition switch to the OFF position. 2. Disconnect the ECM connector EC66. 3. Turn the

ignition switch to the ON position. 4. Measure the voltage between the ECM connector EC66, pin E3

(U) and GROUND.

Is the voltage less than 12 volts?

-> Yes

GO to Pinpoint Test G532451t36.

-> No

GO to Pinpoint Test G532451t35.

G532451t35 : CHECK THE BRAKE CANCEL SWITCH FUNCTION

1. Press the brake pedal.

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Does the voltage drop to zero with the brake pedal pressed?

-> Yes

No fault is indicated with the brake cancel switch or circuit. To continue the diagnostics, return to the

Symptom Chart.

-> No

INSTALL a new brake cancel switch.

Speed Control Deactivator Switch (19.75.20) TEST the system for normal operation.

G532451t36 : CHECK THE VOLTAGE TO THE BRAKE CANCEL SWITCH

1. Disconnect the brake cancel switch connector CR77. 2. Measure the voltage between the brake

cancel connector CR77, pin 01 (WG) and GROUND.

Is the voltage less than 10 volts?

-> Yes

REPAIR the circuit between the brake cancel switch connector CR77, pin 1 (WG) and splice ECS12. For

additional information, refer to the wiring diagrams. TEST the system for normal operation.

-> No

GO to Pinpoint Test G532451t40.

G532451t40 : CHECK THE BRAKE CANCEL SWITCH TO ECM CIRCUIT FOR
OPEN CIRCUIT

1. Turn the ignition switch to the OFF position. 2. Measure the resistance between the ECM

connector EC66, pin E3 (U) and brake cancel switch connector CR77, pin 02 (U).

Is the resistance greater than 5 ohms?

-> Yes

REPAIR the circuit between the ECM connector EC66, pin E3 (U) and the brake cancel switch

connector CR77, pin 02 (U). For additional information, refer to the wiring diagrams. TEST the system

for normal operation.

-> No

INSTALL a new brake cancel switch.

Speed Control Deactivator Switch (19.75.20) TEST the system for normal operation.

Removal and installation

Speed Control Deactivator Switch
(19.75.20)

Removal

1 . Remove the driver side instrument panel lower panel.

2 . Reposition the driver seat to its maximum rearward position.

3 . Remove the speed control deactivator switch.

1) Disconnect the speed control deactivator switch electrical connector.

2) Remove the speed control deactivator switch.

Installation

1

.

To install, reverse the removal procedure.

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