GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was A Diagnostic System Check performed?

--

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

Visually inspect the 20 Amp EXT LP fuse.

Is the fuse open?

--

Go to Step 3

Go to Step 8

3

With switch turned off test terminal D of the headlamp switch for continuity to ground.

Is ground present?

--

Go to Step 4

Go to Step 5

4

Repair short to ground in CKT 240. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

System OK

--

5

Test CKT 9 for Continuity to ground.

Is ground present?

--

Go to Step 6

Go to Step 7

6

Repair short to ground in CKT 9. Refer to Wiring Repairs in Wiring Systems

Is The repair complete?

--

System OK

--

7

Replace blown fuse.

Is the repair complete?

--

System OK

--

8

  1. Disconnect the turn/hazard - headlamp switch assembly connector.
  2. Connect the test lamp between terminal D of the turn/hazard - headlamp switch assembly harness connector C1 and ground.

Does the test lamp light?

--

Go to Step 9

Go to Step 10

9

Connect the test lamp between terminal D and terminal F of the turn/hazard - headlamp switch assembly harness connector.

Do the park, marker and tail lamps light?

--

Go to Step 11

Go to Step 12

10

Repair the open in CKT 240 between the fuse block and the turn/hazard - headlamp switch assembly harness connector. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

System OK

--

11

Replace the turn/hazard - headlamp switch assembly.

Is the repair complete?

--

System OK

--

12

Repair the open in CKT 9. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

System OK

--