GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

1

Did you perform the Lighting System Diagnostic System Check ?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

  1. Turn the ignition to the RUN position.
  2. Engage the turn signal switch in order to turn on the turn signals.

Do the turn signals operate properly?

Go to Step 3

Go to Turn Signal Lamps Inoperative

3

Inspect the HAZARD fuse.

Is the fuse open?

Go to Step 4

Go to Step 5

4

Repair a short to ground in CKT 1840.

Is the repair complete?

Go to Step 8

--

5

  1. Turn the ignition to the RUN position.
  2. Use a test lamp in order to backprobe between C201 terminal E8 and ground.

Did the test lamp light?

Go to Step 7

Go to Step 6

6

Repair the following conditions in CKT 1840:

    • A faulty connection
    • An open circuit

Is the repair complete?

Go to Step 8

--

7

Replace the turn signal switch. Refer to Multifunction, Turn Signal, and Hazard Switch Replacement - On Vehicle in Steering Wheel and Column - Tilt.

Is the repair complete?

Go to Step 8

--

8

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2