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 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 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 , 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 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 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

--