Jaguar XJ (X350). Service manual — part 1180

Is the voltage greater than 3 volts?

-> Yes

REPAIR the short to B+. For additional information, refer to the wiring diagrams. CLEAR the DTC. TEST

the system for normal operation.

-> No

INSTALL a new forward alert switch.

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

If the DTC is repeated, INSTALL a new ACC module.

Speed Control Module (19.75.26)

PINPOINT TEST G532451p2 :
FORWARD ALERT SWITCH CIRCUIT
TEST

G532451t3 : CHECK THE FORWARD ALERT SWITCH CIRCUIT FOR SHORT
CIRCUIT TO GROUND

1. Turn the ignition switch to the OFF position. 2. Disconnect the ACC module connector IP78. 3.

Disconnect the forward alert switch connector IP50. 4. Measure the resistance between the ACC

module connector, IP78 pin 20 (U) and GROUND.

Is the resistance less than 10,000 ohms?

-> Yes

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

TEST the system for normal operation.

-> No

INSTALL a new forward alert switch.

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

If the DTC is repeated, INSTALL a new ACC module.

Speed Control Module (19.75.26)

PINPOINT TEST G532451p3 :
FORWARD ALERT SWITCH LED
CIRCUIT TESTS

G532451t4 : CHECK THE FORWARD ALERT SWITCH LED CIRCUIT FOR OPEN
CIRCUIT

1. Turn the ignition switch to the OFF position. 2. Disconnect the ACC module connector IP78. 3.

Disconnect the forward alert switch connector IP50. 4. Measure the resistance between the ACC

module connector IP78, pin 05 (R) and forward alert switch connector IP50, pin 07 (R).

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

GO to Pinpoint Test G532451t5.

G532451t5 : CHECK THE FORWARD ALERT SWITCH LED CIRCUIT FOR
SHORT CIRCUIT TO B+

1. Turn the ignition switch to the ON position. 2. Measure the voltage between the ACC module

connector IP78, pin 05 (R) and GROUND.

Is the voltage greater than 3 volts?

-> Yes

REPAIR the short to B+. For additional information, refer to the wiring diagrams. CLEAR the DTC. TEST

the system for normal operation.

-> No

INSTALL a new forward alert switch.

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

If the DTC is repeated, INSTALL a new ACC control module, not the forward looking sensor.

PINPOINT TEST G532451p4 :
FORWARD ALERT SWITCH LED
CIRCUIT TESTS

G532451t6 : CHECK THE FORWARD ALERT SWITCH LED CIRCUIT FOR
SHORT CIRCUIT TO GROUND

1. Turn the ignition switch to the OFF position. 2. Disconnect the ACC module connector IP78. 3.

Disconnect the forward alert switch connector IP50. 4. Measure the resistance between the ACC

module connector IP78, pin 05 (R) and GROUND.

Is the resistance less than 10,000 ohms?

www.

-> Yes

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

TEST the system for normal operation.

-> No

INSTALL a new forward alert switch.

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

If the DTC is repeated, INSTALL a new ACC control module, not the forward looking sensor.

PINPOINT TEST G532451p5 : CHIME
CIRCUIT TESTS

G532451t7 : CHECK THE CHIME CIRCUIT FOR OPEN CIRCUIT

1. Turn the ignition switch to the OFF position. 2. Disconnect the ACC module connector IP78. 3.

Disconnect the chime module connector IP11. 4. Measure the resistance between the ACC module

connector IP78, pin 06 (R) and chime module connector IP11, pin 03 (R).

Is the resistance greater than 5 ohms?

-> Yes

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

TEST the system for normal operation.

-> No

GO to Pinpoint Test G532451t8.

G532451t8 : CHECK THE CHIME CIRCUIT FOR SHORT CIRCUIT TO B+

1. Turn the ignition switch to the ON position. 2. Measure the voltage between the ACC module

connector IP78, pin 06 (R) and GROUND.

Is the voltage greater than 3 volts?

-> Yes

REPAIR the short to B+. For additional information, refer to the wiring diagrams. CLEAR the DTC. TEST

the system for normal operation.

-> No

INSTALL a new chime module. CLEAR the DTC. TEST the system for normal operation, If the DTC is

repeated, INSTALL a new ACC module.

PINPOINT TEST G532451p6 : CHIME
CIRCUIT TEST

G532451t9 : CHECK THE CHIME CIRCUIT FOR SHORT CIRCUIT TO GROUND

1. Turn the ignition switch to the OFF position. 2. Disconnect the ACC module connector IP78. 3.

Disconnect the chime module connector IP11. 4. Measure the resistance between the ACC module

connector IP78, pin 06 (R) and GROUND.

Is the resistance less than 10,000 ohms?

-> Yes

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

TEST the system for normal operation.

-> No

INSTALL a new chime module. CLEAR the DTC. TEST the system for normal operation. If the DTC is

repeated, INSTALL a new ACC module.

PINPOINT TEST G532451p7 : FLR
SENSOR CAN CIRCUIT TESTS

G532451t10 : CHECK THE ACC MODULE TO FLR SENSOR CAN 'L' CIRCUIT
FOR OPEN CIRCUIT

1. Turn the ignition switch to the OFF position. 2. Disconnect the ACC module connector IP78. 3.

Disconnect the FLR sensor connector EC23. 4. Measure the resistance between the ACC module

connector IP78, pin 02 (U) and FLR sensor connector EC23, pin 03 (U).

Is the resistance greater than 5 ohms?

-> Yes

CHECK connector IP55 for security. REPAIR the open circuit. For additional information, refer to the

wiring diagrams. CLEAR the DTC. TEST the system for normal operation.

-> No

GO to Pinpoint Test G532451t11.

G532451t11 : CHECK THE ACC MODULE TO FLR SENSOR CAN 'L' CIRCUIT
FOR SHORT CIRCUIT TO B+

1. Turn the ignition switch to the ON position. 2. Measure the voltage between the ACC module

connector IP78, pin 02 (U) and GROUND.

Is the voltage greater than 3 volts?

-> Yes

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

TEST the system for normal operation.

www.