GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Turn the ignition OFF.
  2. Connect a scan tool.
  3. Turn the ignition to the ON position.
  4. Using the scan tool, check for any DTCs in the body control module (BCM).

Does the scan tool show any DTCs?

--

Go to Diagnostic System Check - Body Control System in Body Control System

Go to Step 2

2

Turn the park lamps ON.

Do the park lamps function properly?

--

Go to Step 3

Go to Park Lamps Inoperative

3

Disconnect the headlamp and panel dimmer switch.

Are the instrument panel lamps lit?

--

Go to Step 5

Go to Step 4

4

Replace the headlamp and panel dimmer switch. Refer to Headlamp Switch Replacement .

Is the repair complete?

--

System OK

--

5

Remove the ILLUM fuse.

Are the instrument panel lamps lit?

--

Go to Step 6

Go to Step 7

6

Locate and repair CKT 8 (GRY) for a short to voltage.

Is the repair complete?

--

System OK

--

7

Locate and repair CKT 44 (DK GRN) for a short to voltage.

Is the repair complete?

--

System OK

--