GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Inspect the PARK LP fuse.

Is the fuse open?

--

Go to Step 2

Go to Step 3

2

Repair a short to ground in CKT 1340.

Is the repair complete?

--

Go to Exterior Lights System Check

--

3

  1. Turn the headlamp/instrument panel (IP) lamp dimmer switch to the PARK position.
  2. Use a test light in order to backprobe the headlamp/IP lamp dimmer switch harness connector between terminal R and ground.

Did the test lamp light?

--

Go to Step 7

Go to Step 4

4

Use a test light in order to backprobe the headlamp/IP lamp dimmer switch harness connector between terminal O and ground.

Did the test lamp light?

--

Go to Step 5

Go to Step 6

5

Replace the headlamp/IP lamp dimmer switch. Refer to Headlamp Switch Replacement .

Is the repair complete?

--

Go to Exterior Lights System Check

--

6

Repair the following conditions in CKT 1340 between the PARK LP fuse and the headlamp and the IP lamp dimmer switch harness connector terminal O:

    • A faulty connection
    • An open circuit

Is the repair complete?

--

Go to Exterior Lights System Check

--

7

Repair the following conditions in CKT 9 between the headlamp and the IP lamp dimmer switch harness connector terminal R and S405:

    • A faulty connection
    • An open circuit

Is the repair complete?

--

Go to Exterior Lights System Check

--