GM Service Manual Online
For 1990-2009 cars only

Headlight Doors Diagnostic System Check

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

Turn the headlamp switch to the ON positon (headlamps on).

Headlight doors open.

Both Headlight Doors Never Open.

2

Turn the headlamp switch to the OFF positon.

Headlight doors close.

Both Headlight Doors Always Open.

* Refer to the appropriate symptom diagnostic table for the applicable abnormal result.