Schematic Reference: Exterior Lights Schematics

Connector End View Reference: Lighting Systems Connector End Views or Data Communication Connector End Views

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

Verify that the tail, marker and license lamps are inoperative.

Do the tail, marker and license lamps operate normally?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

1. Remove the park lamp relay.
2. Ensure that the headlamp switch is in the HEAD position.
3. Test for a ground signal at the park lamp relay control circuit terminal in the body relay block. Refer to Circuit Testing .

Was a ground signal present?

Go to Step 8

Go to Step 4

Use the scan tool to check the body control module (BCM) park lamp switch input data.

Does the scan tool indicate a park lamps ON request signal?

Go to Step 7

Go to Step 5

Test for an open or high resistance in the park lamp switch signal circuit. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 11

Go to Step 6

Inspect for poor connections at the harness connector of the headlamp switch. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 11

Go to Step 9

Inspect for poor connections at the harness connector of the BCM. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 11

Go to Step 10

Replace the park lamp relay. Refer to Relay Replacement .

Did you complete the repair?

Go to Step 11

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Replace the headlamp switch. Refer to Headlamp Switch Replacement .

Did you complete the repair?

Go to Step 11

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Replace the BCM. Refer to Control Module References for replacement, setup, and programming.

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 3