GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics

1

Did you review the Exterior Lighting Systems Description and Operation and perform the necessary inspections?

Go to Step 2

Go to Exterior Lighting Systems Description and Operation

2

Verify that the turn signal lamps and/or indicators are always on or flashing.

Do the turn signal lamps operate normally?

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

Go to Step 3

3

Are only the turn signal indicators in the IP cluster always on or flashing?

Go to Step 9

Go to Step 4

4

Is only one turn signal lamp or the turn signal lamps on one side of the vehicle always on or flashing?

Go to Step 5

Go to Step 6

5

Inspect the affected bulb/socket for an internal short, poor terminal contact, or a shorted filament.

Was a problem found?

Go to Step 10

Go to Step 6

8

Disconnect the hazard warning switch.

Do the turn signals and indicators still illuminate with the multifunction turn signal switch in any position?

Go to Step 7

Go to Step 12

7

Test the turn signal lamp supply voltage and turn signal switch signal circuits for a short to voltage. Refer to Circuit Testing in Wiring Systems.

Was a problem found?

Go to Step 8

Go to Step 11

8

Repair the short to voltage in the turn signal lamp supply voltage circuit or the turn signal switch signal circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 13

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9

Replace the instrument cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gages, and Console.

Did you complete the repair?

Go to Step 13

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10

Replace or repair the affected bulb/socket.

Did you complete the repair?

Go to Step 13

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11

Replace the multifunction turn signal switch. Refer to Turn Signal Switch Replacement - On Vehicle in Steering Wheel and Column.

Did you complete the repair?

Go to Step 13

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12

Replace the hazard warning switch. Refer Hazard Warning Switch Replacement .

Did you complete the repair?

Go to Step 13

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13

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3