GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Lighting Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

Disconnect the headlamp and panel dimmer switch connector.

Does the affected lamp assembly remain lit?

--

Go to Step 3

Go to Step 4

3

Remove the ILLUM fuse (Fuse 14).

Does the affected lamp remain lit?

--

Go to Step 5

Go to Step 6

4

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

Is the replacement complete?

--

Go to Step 7

--

5

Repair the short to voltage in CKT 8 (GRY) between the headlamp and panel dimmer switch and the affected lamp module assembly.

Is the repair complete?

--

Go to Step 7

--

6

Repair the short to voltage in CKT 44 (DK GRN) between the headlamp and panel dimmer switch and the instrument panel fuse block.

Is the repair complete?

--

Go to Step 7

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7

Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 2