GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics

1

Did you perform the Lighting System Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

  1. Turn the ignition switch to the OFF position.
  2. Place the headlamp switch in the HEAD position.
  3. Place the headlamp switch in the OFF position.
  4. Engage the parking brake.
  5. Turn the ignition switch to the ON position.
  6. Place the turn signal switch in the OFF position.

Are any of the turn signals illuminated?

Go to Step 4

Go to Step 3

3

Place the turn signal switch in the RH ON position and then to the LH ON position.

Do the turn signals operate properly?

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

Go to Step 7

4

Are the turn signal lamps flashing?

Go to Step 8

Go to Step 5

5

Is only one turn signal lamp illuminated at all times?

Go to Step 6

Go to Step 8

6

Repair a short to voltage in the turn signal supply voltage circuit of the affected turn signal. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 9

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7

If the corresponding turn signal illuminates but does not flash when the turn signal switch is ON, replace the hazard switch. Refer to Hazard Warning Switch Replacement in Instrument Panel, Gages and Console .

Did you complete the replacement?

Go to Step 9

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8

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

Did you complete the replacement?

Go to Step 9

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9

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2