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 Wiring 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 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

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6

Repair 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

Repair 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

Operate the system in order to verify the repair.

Did you correct the condition?

Go to Diagnostic System Check - Lighting Systems in Wiring Systems.

Go to Step 2