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

  1. Repair a short to ground in CKT 1340.
  2. Inspect the system.

Is the symptom still present?

--

Go to Step 3

Go to Interior Lights Dimming System Check

3

  1. Turn the headlamp switch to the PARK position on the headlamp and the instrument panel (IP) lamp dimmer switch.
  2. Use a test lamp in order to backprobe between the headlamp and the IP dimmer switch terminal O and ground.

Does the test lamp light?

--

Go to Step 5

Go to Step  4

4

  1. Repair the following conditions in CKT 1340 between the fuse block terminal E1 and the headlamp and the IP dimmer switch harness connector terminal  O.
  2. • A poor connection
    • An open
  3. Inspect the system.

Is the symptom still present?

--

Go to Step 5

Go to Interior Lights Dimming System Check

5

  1. Replace the headlamp and the IP lamp dimmer switch. Refer to Headlamp Switch Replacement .
  2. Inspect the system.

Is the symptom still present?

--

--

Go to Interior Lights Dimming System Check