GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

1

Did you review the Headlights/Daytime Running Lights (DRL) Circuit Description and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Lighting Systems

2

Verify that one headlamp is inoperative.

Do the headlamps operate normally?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

Is the RH headlamp inoperative?

Go to Step 5

Go to Step 4

4

Is the LH headlamp inoperative?

Go to Step 13

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

5

Are both low and high beams of the RH headlamp inoperative?

Go to Step 6

Go to Step 9

6

Using a J 35616-200 unpowered test lamp, backprobe connector C1, cavity 2 of fuse block.

Does the test lamp illuminate?

Go to Step 7

Go to Step 8

7

Repair the open WHT/RED wire between connector cavity 3 of the RH headlamp and connector C1, cavity 2 of fuse block. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 20

--

8

Replace the fuse block.

Is the repair complete?

Go to Step 20

--

9

Is the RH low beam inoperative?

Go to Step 10

Go to Step 11

10

Repair the open RED/WHT wire between cavity 2 of the RH headlamp connector and S234. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 20

--

11

Is the RH high beam inoperative?

Go to Step 12

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

12

Repair the open RED wire between cavity 1 of the RH headlamp connector and S244. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 20

--

13

Are both low and high beams of the LH headlamp inoperative?

Go to Step 14

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

14

Using a J 35616-200 unpowered test lamp, backprobe connector C1, cavity 3 of fuse block 1.

Did the test lamp light?

Go to Step 15

Go to Step 16

15

Repair the open WHT/BLU wire between connector cavity 3 of the LH headlamp and connector C1, cavity 3 of fuse block. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 20

--

16

Is the LH low beam inoperative?

Go to Step 17

Go to Step 18

17

Repair the open RED/WHT wire between cavity 1 of the RH headlamp connector and S233. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 20

--

18

Is the LH high beam inoperative?

Go to Step 19

Go to Testing for Intermittent Conditions and Poor Connections

19

Repair the open RED wire between cavity 2 of the RH headlamp connector and S234. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 20

--

20

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3