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 or Data Communication Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

Turn ON the hazard flashers.

Does the system operate normally?

Go to Testing for Electrical Intermittents

Go to Step 3

3

  1. Turn ON the ignition with the engine OFF.
  2. Turn ON each turn signal.

Do the turn signals function properly?

Go to Step 4

Go to Turn Signal Lamps and/or Indicators Inoperative

4

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

Does the test lamp illuminate?

Go to Step 8

Go to Step 5

5

Test the hazard switch signal circuit of the turn signal/hazard flasher module for high resistance or an open. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 11

Go to Step 6

6

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

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 multifunction switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 11

Go to Step 9

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 .

Did you find and correct the condition?

Go to Step 11

Go to Step 10

9

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

Did you complete the replacement?

Go to Step 11

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10

Replace the turn signal/hazard flasher module. Refer to Control Module References .

Did you complete the replacement?

Go to Step 11

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11

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3