GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics

1

Did you perform the Lighting Systems Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

Verify that the hazard lamps are inoperative.

Do the hazard lamps operate normally?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

Inspect the STOP/HAZ fuse in the IP fuse block.

Is the fuse open?

Go to Step 4

Go to Step 5

4

Test for a short to ground in the following circuits. Refer to Circuit Testing in Wiring Systems.

    • Battery positive voltage
    • Hazard indicator supply voltage

Was a problem found?

Go to Step 8

Go to Step 12

5

Using a test lamp from ground, backprobe the battery positive voltage circuit to the turn/hazard switch at connector C201. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

Go to Step 6

Go to Step 9

6

  1. Activate the hazard switch.
  2. Using a test lamp from ground, backprobe the hazard indicator supply voltage circuit at connector C201. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

Go to Step 7

Go to Step 11

7

Test for an open or high resistance in the following circuits. Refer to Circuit Testing in Wiring Systems.

    • Hazard indicator supply voltage
    • Turn signal flasher control
    • Turn signal flasher ground

Was a problem found?

Go to Step 10

Go to Step 12

8

Repair the short to ground in one of the following circuits. Refer to Wiring Repairs in Wiring Systems.

    • Battery positive voltage
    • Hazard indicator supply voltage

Did you complete the repair?

Go to Step 13

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9

Repair the open or high resistance in the battery positive voltage circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 13

--

10

Repair the open or high resistance in one of the following circuits. Refer to Wiring Repairs in Wiring Systems.

    • Hazard indicator supply voltage
    • Turn signal flasher control
    • Turn signal flasher ground

Did you complete the repair?

Go to Step 13

--

11

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

Did you complete the repair?

Go to Step 13

--

12

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

Did you complete the repair?

Go to Step 13

--

13

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3