SCHEMATIC REFERENCE: Headlights Schematics

Did you perform the Lighting Systems Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

Do the park lamps operate properly?

Go to Step 3

Go to Step 6

1. Connect a test lamp from battery positive voltage (B+) to the headlamp switch input circuit at the lighting control module (LCM).
2. Turn ON the ignition, with the engine OFF.
3. Turn ON the headlamps.

Does the test lamp illuminate with the headlamp switch?

Go to Step 9

Go to Step 4

1. Turn OFF the ignition.
2. Connect a test lamp from battery positive voltage (B+) to the headlamp switch input circuit at the headlamp switch.
3. Turn ON the ignition, with the engine OFF.
4. Turn ON the headlamps.

Does the test lamp illuminate with the headlamp switch?

Go to Step 5

Go to Step 7

Repair the open or high resistance in the headlamp switch input circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 11

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Test the headlamp switch ground circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 7

Inspect for poor connections at the headlamp switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 8

Replace the headlamp switch. Refer to Headlamp Switch Replacement .

Did you complete the replacement?

Go to Step 11

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Inspect for poor connections at the LCM connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 10

Replace the LCM. Refer to Lamp Control Module Replacement .

Did you complete the replacement?

Go to Step 11

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2