GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Backprobe the left HI beam headlamp with a test lamp from terminal B to ground.

Did the test lamp light?

--

Go to Step 2

Go to Step 3

2

Backprobe the left HI beam headlamp with a test lamp from terminal C to B+.

Did the test lamp light?

--

Go to Step 4

Go to Step 5

3

Repair the open in CKT 688 (RED/YEL) between S229 and the left HI beam headlamp.

Did the headlamp light?

--

System OK

--

4

Replace the HI beam headlamp.

Did the headlamp light?

--

System OK

--

5

Repair the open in CKT 690 or CKT 692 (BLK/WHT) between the left HI beam headlamp and S317.

Did the headlamp light?

--

System OK

--