GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

1

Did you perform the Lighting Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems in 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

Go to Step 3

3

Remove the park lamp Relay.

Do the lamps remain on?

Go to Step 4

Go to Step 5

4

Remove the Front park lamp fuse.

Do the front park lamps remain on?

Go to Step 6

Go to Step 7

5

Replace the park lamp Relay.

Is the repair completed?

Go to Step 8

--

6

Test for a short to B+ on the front park lamps feed circuit . Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 8

--

7

Test for a short to B+ on the rear park lamps feed circuit . Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 8

--

8

Retest the system in order to verify the repair.

Is the condition corrected?

Go to Diagnostic System Check - Lighting Systems

Go to Symptoms