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 circuit 1340.

Has the repair been made?

--

Go to Interior Lights Dimming System Check

--

3

  1. Turn the headlamp switch to the PARK position.
  2. Turn the instrument panel lamp dimmer switch to the HIGH position.
  3. Use a test light backprobe between the headlamp switch harness connector terminal O and ground.

Does the test light illuminate?

--

Go to Step 5

Go to Step 4

4

Repair the poor connection or open in circuit 1340.

Has the repair been made?

--

Go to Interior Lights Dimming System Check

--

5

Using a test light, backprobe between the headlamp switch harness connector terminal H and ground.

Does the test light illuminate?

--

Go to Step 7

Go to Step 6

6

Replace the headlamp switch. Refer to Headlamp Switch Replacement .

Has the repair been made?

--

Go to Interior Lights Dimming System Check

--

7

Repair the poor connection or open in circuit 8 between the headlamp switch harness connector terminal H and S203.

Has the repair been made?

--

Go to Interior Lights Dimming System Check

--