GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

1

Did you perform the Lighting Systems Diagnostic System Check?

Go to Step 2

Go to A Diagnostic System Check - Lighting Systems

2

Visually inspect the headlamp assembly for a malfunction or a poor wiring harness connection. Refer to Testing for Intermittents and Poor Connections and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

System OK

Go to Step 3

3

Test for an open in the ground CKT 150 at terminal A of the left headlamp assembly. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

System OK

Go to Step 4

4

Replace the left headlamp. Refer to Headlamp Bulb Replacement.

Did you complete the repair?

System OK

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