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

Do the turn lamps flash?

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Go to Step 3

Go to Step 4

3

  1. Turn ON the ignition.
  2. Connect a test lamp between the appropriate turn signal input circuit at the turn signal switch and a good ground.

Does the test lamp illuminate?

--

Go to Step 8

Go to Step 5

4

Disconnect the turn signal/hazard flasher module.

Did the turn signal lamp turn OFF?

--

Go to Step 6

Go to Step 11

5

Connect a test lamp from the appropriate turn signal input circuit at the turn signal/hazard flasher module to ground.

Does the test lamp illuminate?

--

Go to Step 10

Go to Step 6

6

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?

--

Go to Step 12

Go to Step 7

7

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

Did you complete the replacement?

--

Go to Step 12

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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?

--

Go to Step 12

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.

Did you complete the replacement?

--

Go to Step 12

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10

Repair the short to battery positive voltage (B+) in the appropriate turn signal input circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 12

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11

Repair the short to battery positive voltage (B+) in turn signal lamp circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 12

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12

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