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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 G532451p1 : FORWARD ALERT SWITCH CIRCUIT TESTS
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PINPOINT TEST G532451p1 : FORWARD ALERT SWITCH CIRCUIT TESTS



Pinpoint Tests

PINPOINT TEST G532451p1 : FORWARD ALERT SWITCH CIRCUIT TESTS

G532451t1 : CHECK THE FORWARD ALERT SWITCH 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 20 (U) and forward alert switch connector IP50, pin 04 (U).

- 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 G532451t2.

G532451t2 : CHECK THE FORWARD ALERT SWITCH 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 20 (U) 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 module.
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