GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics

Connector End View Reference: Master Electrical Component List in Wiring Systems

1

Did you perform the Lighting Systems Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

  1. Turn ON the ignition, with the engine OFF.
  2. Observe the hazard lamps.
  3. Turn ON the hazard lamp switch.
  4. Turn OFF the hazard lamp switch.
  5. Turn OFF the ignition.

Did the hazard flashers operate properly?

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

Go to Step 3

3

Do the turn signal lamps operate properly?

Go to Step 4

Go to Turn Signal Lamps and/or Indicators Inoperative

4

  1. Disconnect the turn signal/hazard flasher module.
  2. Connect a test lamp between the hazard switch signal circuit of the turn signal/hazard flasher module and battery positive voltage.
  3. Turn ON the hazard switch.

Does the test lamp illuminate?

Go to Step 8

Go to Step 5

5

Test the hazard switch ground circuit for high resistance or open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 6

6

Test the hazard switch signal circuit for high resistance or open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 7

7

Inspect for poor connections at the harness connector of the turn signal/multifunction switch. Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 10

8

Inspect for poor connections at the harness connector of the turn signal/hazard flasher module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 9

9

Replace the turn signal/hazard flasher module. Refer to Hazard Lamp Flasher Replacement .

Did you complete the replacement?

Go to Step 11

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10

Replace the turn signal/multifunction switch. Refer to Turn Signal Multifunction Switch Replacement in Steering Wheel and Column.

Did you complete the replacement?

Go to Step 11

--

11

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2