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Home >> Jaguar >> 2007 >> XJ (X350) V8-4.2L SC >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Pinpoint Tests >> Speed Control >> PINPOINT TEST G532451p3 : FORWARD ALERT SWITCH LED CIRCUIT TESTS
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PINPOINT TEST G532451p3 : FORWARD ALERT SWITCH LED CIRCUIT TESTS



Pinpoint Tests

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. 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+. CLEAR the DTC. TEST the system for normal operation.

-> NO
INSTALL a new forward alert switch. 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.
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