Schematic Reference: Exterior Lights Schematics

Connector End View Reference: Lighting Systems Connector End Views or Computer/Integrating Systems Connector End Views in Computer/Integrating Systems

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

Verify that the park, license and tail lamps are always on.

Do the park, license, and tail lamps operate normally?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

Remove the park lamp relay. Refer to Relay Replacement in Wiring Systems.

Do the park lamps turn OFF?

Go to Step 4

Go to Step 9

1. Ensure that the headlamp switch is in the OFF or AUTO position and there is sufficient light to the ambient light sensor.
2. Test for a ground signal at the park lamp relay control circuit terminal in the underhood fuse block. Refer to Electrical Center Identification Views and Circuit Testing in Wiring Systems.

Was a ground signal present?

Go to Step 5

Go to Step 10

Use the scan tool to check the body control module (BCM) Park Lamp Switch input data.

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

Go to Step 8

Go to Step 6

Test for a short to ground in the park lamp switch on signal circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 13

Go to Step 7

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

Did you find and correct the condition?

Go to Step 13

Go to Step 11

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

Did you find and correct the condition?

Go to Step 13

Go to Step 12

Repair the short to voltage in one of the following circuits. Refer to Wiring Repairs in Wiring Systems:

Did you complete the repair?

Go to Step 13

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Replace the park lamp relay. Refer to Relay Replacement in Wiring Systems.

Did you complete the repair?

Go to Step 13

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Replace the headlamp switch. Refer to Headlamp Switch Replacement .

Did you complete the repair?

Go to Step 13

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Replace the BCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 13

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1. Use the scan tool in order to clear any induced DTCs.
2. Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3