GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Turn the headlamp switch to the PARK position.
  2. Turn the dimmer switch to the HIGH position.
  3. Using a test light, backprobe between the inoperable lamp harness connector circuit 8 and ground.

Does the test light illuminate?

--

Go to Step 3

Go to Step 2

2

Repair a poor connection or an open in circuit 8 between S203 and the inoperable component.

Is the repair complete?

--

Go to Diagnostic System Check - Lighting Systems

--

3

Using a test light, backprobe the inoperable lamp harness connector between circuit 8 and ground (circuit 750, 1450 or 1750).

Does the test light illuminate?

--

Go to Step 5

Go to Step 4

4

Repair a poor connection or an open in the ground circuit between the inoperable component (circuit 750, 1450 or 1750) and G200, G201, G203, or G301.

Is the repair complete?

--

Go to Diagnostic System Check - Lighting Systems

--

5

Replace the bulb/inoperable component.

Is the repair complete?

--

Go to Diagnostic System Check - Lighting Systems

--