Did you perform the Headlight Diagnostic System Check?

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Go to Step 2

Go to Headlight System Check

1. Disconnect the lamp control module (LCM) connector C2.
2. Turn the ignition switch to the RUN position.
3. Connect a J 39200 digital multimeter (DMM) between the LCM connector C2 cavity A7 (PNK) and ground.

Is the voltage within the specified range?

10-15 V

Go to Step 3

Go to Step 7

1. Connect a DMM between the LCM connector C2 cavity A6 (PPL) and ground.
2. Vary the twilight delay control from MIN to MAX.

Does the resistance vary within the specified range?

3.5 kohms-200 kohms

Go to Step 4

Go to Step 8

1. Cover the ambient light sensor.
2. Connect a DMM between the LCM connector C2 cavity A5 (WHT) and ground.

Is the resistance greater than the specified value?

31 kohms

Go to Step 5

Go to Step 11

1. Expose the ambient light sensor to a bright incandescent light.
2. Connect a DMM between the LCM connector C2 terminal A5 (WHT) and ground.

Is the resistance less than the specified value?

23 kohms

Go to Step 6

Go to Step 11

Replace the LCM. Refer to Headlamp Control Module Replacement .

Is the LCM replacement complete?

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Go to Headlight System Check

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Repair the open in CKT 39 (PNK) between the underhood junction block and the LCM. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Headlight System Check

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Test CKT 1783 (PPL) between the LCM and the headlamp switch for an open or a short to ground. Refer to Testing for Continuity or Testing for Short to Ground in Wiring Systems.

Is there an open or short to ground in CKT 1783?

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Go to Step 9

Go to Step 14

Test CKT 351 (BLK/WHT) between the headlamp switch and S213 for an open. Refer to Testing for Continuity in Wiring Systems.

Is there an open in CKT 351?

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Go to Step 10

Go to Step 14

Replace the headlamp switch.

Is the headlamp switch replacement complete?

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Go to Headlight System Check

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Test CKT 278 (WHT) for an open or a short to ground. Refer to Testing for Continuity or Testing for Short to Ground in Wiring Systems.

Is there an open or short to ground in CKT 278?

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Go to Step 12

Go to Step 14

Test CKT 351 (BLK/WHT) between the ambient light sensor and S213 for an open. Refer to Testing for Continuity in Wiring Systems.

Is there an open in CKT 351?

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Go to Step 13

Go to Step 14

Replace the ambient light sensor. Refer to Defroster Grille Replacement in Instrument Panel, Gauges, and Console.

Is the ambient light sensor replacement complete?

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Go to Headlight System Check

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Repair the faulty wiring. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Headlight System Check

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