GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

DEFINITION: Both low and high beam filaments are inoperative.

1

Backprobe the headlamp with a test lamp from terminal C to ground.

Did the test lamp light?

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Go to Step 2

Go to Step 3

2

Replace the headlamp.

Is the repair complete?

--

System OK

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3

Repair the open in CKT 688, 689 (RED/YEL) or CKT 694, 695 (RED/WHT) between the IP fuse block and the left/right headlamp.

Is the repair complete?

--

System OK

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