GM Service Manual Online
For 1990-2009 cars only

Headlamps Inoperative - One Lamp Left

Step

Action

Value(s)

Yes

No

DEFINITION: Both low and high beam filaments are inoperative

1

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

Did the test lamp light?

--

Go to Step 2

Go to Step 3

2

Replace the left headlamp.

Is the repair complete?

--

System OK

--

3

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

Is the repair complete?

--

System OK

--

Headlamps Inoperative - One Lamp Right

Step

Action

Value(s)

Yes

No

DEFINITION: Both low and high beam filaments are inoperative

1

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

Did the test lamp light?

--

Go to Step 2

Go to Step 3

2

Replace the right headlamp.

Do the headlamps light?

--

System OK

--

3

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

Do the headlamps light?

--

System OK

--