GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics

Connector End View Reference: Lighting Systems Connector End Views

1

Did you review the Exterior Lighting Systems Description and Operation and perform the necessary inspections?

Go to Step 2

Go to Exterior Lighting Systems Description and Operation

2

Verify that the hazard lamps are inoperative.

Do the hazard lamps operate normally?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

Do the turn signal lamps operate normally?

Go to Step 4

Go to Symptoms - Lighting Systems

4

  1. Disconnect the turn/hazard flasher.
  2. Activate the hazard lamp switch.
  3. Test for a ground signal at the hazard switch signal circuit input terminal of the turn/hazard flasher connector. Refer to Circuit Testing .

Is a ground signal present?

Go to Step 6

Go to Step 5

5

Test the multifunction turn signal switch hazard switch signal circuit and ground circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct a condition?

Go to Step 10

Go to Step 7

6

Inspect for poor connections at the harness connector of the hazard/turn flasher. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct a condition?

Go to Step 10

Go to Step 8

7

Inspect for poor connections at the harness connector of the multifunction turn signal switch. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 10

Go to Step 9

8

Replace the hazard/turn flasher. Refer to Hazard and Turn Signal Flasher Replacement .

Did you complete the repair?

Go to Step 10

--

9

Replace the multifunction turn signal switch. Refer to Turn Signal Multifunction Switch Replacement .

Did you complete the repair?

Go to Step 10

--

10

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3