GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics

1

Did you perform the Lighting Systems Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

Verify the reported condition , Park Lamps Always On, does exist.

Does the system operate normally?

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

Go to Step 3

3

Remove the park lamp relay.

Do the lamps remain ON?

Go to Step 4

Go to Step 7

4

Remove the FRONT PARK LP fuse.

Do the front park lamps remain ON?

Go to Step 5

Go to Step 6

5

Repair a short to battery positive voltage on the front park lamps voltage supply circuit . Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 8

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6

Repair a short to battery positive voltage on the rear park lamps feed circuit . Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find the short to battery positive voltage in the rear park lamps feed circuit?

Go to Step 8

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7

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

Did you complete the replacement?

Go to Step 8

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8

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2