Jaguar XJ (X350). Manual — part 1177

G240073t25 : CHECK THE STEERING WHEEL SPEED CONTROL HEADWAY-
SWITCH CIRCUIT

1. Measure the resistance between the ECM connector PI01, pin 47 (WG) and ECM connector PI01,

pin 48 (YG). 2. Operate the HEADWAY- switch.

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

-> Yes

GO to Pinpoint Test G240073t26.

-> No

INSTALL a new speed control switch assembly.

Speed Control Switch (19.75.25) TEST the system for normal operation.

G240073t26 : CHECK THE STEERING WHEEL SPEED CONTROL HEADWAY+
SWITCH CIRCUIT

1. Measure the resistance between the ECM connector PI01, pin 47 (WG) and ECM connector PI01,

pin 48 (YG). 2. Operate the HEADWAY+ switch.

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

-> Yes

GO to Pinpoint Test G240073t27.

-> No

INSTALL a new speed control switch assembly.

Speed Control Switch (19.75.25) TEST the system for normal operation.

G240073t27 : CHECK THE STEERING WHEEL SPEED CONTROL SET- SWITCH
CIRCUIT

1. Measure the resistance between the ECM connector PI01, pin 47 (WG) and ECM connector PI01,

pin 48 (YG). 2. Operate the SET- switch.

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

-> Yes

GO to Pinpoint Test G240073t28.

-> No

INSTALL a new speed control switch assembly.

Speed Control Switch (19.75.25) TEST the system for normal operation.

G240073t28 : CHECK THE STEERING WHEEL SPEED CONTROL CANCEL
SWITCH CIRCUIT

1. Measure the resistance between the ECM connector PI01, pin 47 (WG) and ECM connector PI01,

pin 48 (YG). 2. Operate the CANCEL switch.

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

-> Yes

No fault is indicated with the steering wheel speed control switches or circuit. To continue the

diagnostics, return to the Symptom Chart.

-> No

INSTALL a new speed control switch assembly.

Speed Control Switch (19.75.25) TEST the system for normal operation.

G240073t29 : CHECK THE STEERING WHEEL SPEED CONTROL SWITCH
CIRCUIT FOR OPEN CIRCUIT

1. Disconnect the clockspring connector SW08. 2. Measure the resistance between the clockspring

connector SW08, pin 08, component side and clockspring connector SW08, pin 06, component side.

Is the resistance 4310 ohms?

-> Yes

GO to Pinpoint Test G240073t31.

-> No

GO to Pinpoint Test G240073t30.

G240073t30 : CHECK THE STEERING WHEEL SPEED CONTROL SWITCH FOR
OPEN CIRCUIT

1. Disconnect the steering wheel speed control switch. 2. Measure the resistance between the

steering wheel speed control switch connector pins 01 and 02 component side.

Is the resistance 4310 ohms?

-> Yes

INSTALL a new clockspring.

Clockspring (86.65.92) TEST the system for normal operation.

-> No

INSTALL a new speed control switch assembly.

Speed Control Switch (19.75.25) TEST the system for normal operation.

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G240073t31 : CHECK THE STEERING WHEEL SPEED CONTROL SWITCH
CIRCUIT FOR OPEN CIRCUIT

1. Measure the resistance between the ECM connector PI01, pin 47 (WG) and clockspring connector

SW08, pin 08 (YR).

Is the resistance greater than 5 ohms?

-> Yes

REPAIR the circuit ECM connector PI01, pin 47 (WG) to clockspring connector SW08, pin 08 (YR). For

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

-> No

GO to Pinpoint Test G240073t36.

G240073t36 : CHECK THE STEERING WHEEL SPEED CONTROL SWITCH
CIRCUIT FOR OPEN CIRCUIT

1. Measure the resistance between the ECM connector PI01, pin 48 (YG) and clockspring connector

SW08, pin 06 (YG).

Is the resistance greater than 5 ohms?

-> Yes

REPAIR the circuit ECM connector PI01, pin 48 (YG) to clockspring connector SW08, pin 06 (YG). For

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

-> No

INSTALL a new speed control switch assembly.

Speed Control Switch (19.75.25) TEST the system for normal operation.

PINPOINT TEST G240073p8 : BRAKE
CANCEL SWITCH CIRCUIT TEST

G240073t32 : CHECK THE BRAKE CANCEL SWITCH CIRCUIT FOR OPEN

1. Disconnect the battery negative terminal.

Battery Disconnect and Connect 2. Disconnect the ECM connector PI01. 3. Reconnect the battery

negative terminal.

Battery Connect (86.15.15) 4. Turn the ignition switch to the ON position. 5. Measure the voltage

between the ECM connector PI01, pin 09 (U) and GROUND.

Is the voltage less than 12 volts?

-> Yes

GO to Pinpoint Test G240073t34.

-> No

GO to Pinpoint Test G240073t33.

G240073t33 : CHECK THE BRAKE CANCEL SWITCH FUNCTION

1. Press the brake pedal.

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.

G240073t34 : CHECK THE VOLTAGE TO THE BRAKE CANCEL SWITCH

1. Disconnect the brake cancel switch connector SW08. 2. Measure the voltage between the brake

cancel connector SW08, pin 01 (WG) and GROUND.

Is the voltage less than 10 volts?

-> Yes

REPAIR the circuit between the brake cancel switch connector SW08, 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 G240073t35.

G240073t35 : CHECK THE BRAKE CANCEL SWITCH CIRCUIT FOR OPEN
CIRCUIT

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

connector PI01, pin 09 (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 PI01, pin 09 (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.

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