GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Lighting Systems Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

  1. Connect a scan tool to the Data Link Connector (DLC).
  2. Inspect the IPC headlamp switch and parklamp input.

Does the headlamp switch operate properly?

--

Go to Step 3

Go to Step 4

3

Replace the body control module (PZM). Refer to Body Control Module Replacement in Body Control Systems.

Is the body control module replacement complete?

--

Go to Step 5

--

4

Replace the headlamp switch. Refer to Headlamp Switch Replacement in Lighting Systems.

Is the headlamp switch replacement complete?

--

Go to Step 5

--

5

Operate the system in order to verify the repair. Did you correct the condition?

--

System OK.

Go to Step 2