GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Lighting Systems Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

  1. Turn ON the ignition.
  2. Place the turn signal switch in the inoperative position.
  3. Connect a test lamp between the appropriate turn signal switch output circuit at the turn signal switch and a good ground.

Does the test lamp illuminate?

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Go to Step 3

Go to Step 8

3

Connect a test lamp between the appropriate turn signal input circuit at the turn signal/hazard flasher module and a good ground.

Does the test lamp illuminate?

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Go to Step 4

Go to Step 7

4

Test the appropriate turn signal output circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 10

Go to Step 5

5

Inspect for poor connections at 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?

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Go to Step 10

Go to Step 6

6

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

Did you complete the replacement?

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Go to Step 10

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7

Repair the open in the appropriate turn signal input circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 10

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8

Inspect for poor connections at the turn signal switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

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Go to Step 10

Go to Step 9

9

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

Is the replacement complete?

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Go to Step 10

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10

Operate the system in order to verify the repair.

Did you find and correct the condition?

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System OK

Go to Step 2