GM Service Manual Online
For 1990-2009 cars only

Low and High Beams Headlamps Inoperative Daytime Running Lamps

Step

Action

Value(s)

Yes

No

1

Did you perform the Headlights System Check?

--

Go to Step 2

Go to Headlight System Check

2

  1. Turn the headlamp switch to the ON position.
  2. Backprobe the headlamp and panel dimmer switch connector with a J 35616-200 test lamp from cavity G to ground.

Does the test lamp light?

--

Go to Step 3

Go to Step 4

3

  1. Disconnect the headlamp dimmer switch connector.
  2. Connect a J 35616-200 test lamp from the headlamp dimmer switch connector, cavity D, to ground.

Does the test lamp light?

--

Go to Step 5

Go to Step 6

4

Replace the headlamp and panel dimmer switch.

Is the repair complete?

--

Go to Headlight System Check

--

5

Replace the headlamp dimmer switch.

Is the repair complete?

--

Go to Headlight System Check

--

6

Repair the open in CKT 10 (YEL) between the headlamp and panel dimmer switch.

Is the repair complete?

--

Go to Headlight System Check

--

Low and High Beams Headlamps Inoperative Headlamps

Step

Action

Value(s)

Yes

No

1

Did you perform the Headlights System Check?

--

Go to Step 2

Go to Headlight System Check

2

  1. Disconnect connector C266.
  2. Connect a J 39200 DMM, set on ohms, between connector C266, cavity E13 for CKT 10 (YEL), and cavity E12 for CKT 12 (TAN).
  3. Operate the headlamp switch at least twice.

Is there continuity?

--

Go to Step 3

Go to Step 5

3

  1. Disconnect the headlamp switch connector.
  2. Connect a J 39200 DMM between C266, cavity E13, and the headlamp and panel dimmer switch connector, cavity G for CKT 10 (YEL).

Is there continuity?

--

Go to Step 4

Go to Step 6

4

Connect a J 35616-200 test lamp between the headlamp and panel dimmer switch connector, cavity C for CKT 42 (RED), and ground.

Does the test lamp light?

--

Go to Step 7

Go to Step 8

5

Repair an open in CKT 10 (YEL) or in CKT 12 (TAN) in the steering column.

Did you find and repair the condition?

--

Go to Headlight System Check

Go to Step 7

6

Repair the open in CKT 10 (YEL) between the headlamp and panel dimmer switch and connector C266.

Did you find and repair the condition?

--

Go to Headlight System Check

--

7

Replace the headlamp switch. Refer to Headlamp Switch Replacement

Is the repair complete?

--

Go to Headlight System Check

--

8

Repair the open in CKT 42 (RED) between the underhood fuse-relay center and the headlamp and panel dimmer switch.

Did you find and repair the condition?

--

Go to Headlight System Check

--