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

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

Do the turn signals operate properly?

Go to Step 3

Go to Turn Signal Lamps and/or Indicators Inoperative

3

  1. Turn OFF the ignition.
  2. Disconnect the inoperative repeater lamp bulb.
  3. Connect a test lamp between the turn signal lamp voltage supply circuit of the inoperative repeater lamp and the ground circuit of the inoperative repeater lamp.
  4. Turn ON the ignition, with the engine OFF.
  5. Place the turn signal switch in the appropriate position.

Does the test lamp flash ON and OFF?

Go to Step 5

Go to Step 4

4

Test for an open or high resistance in the front turn signal lamp supply voltage circuit. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 8

Go to Step 6

5

Inspect for poor connections at the inoperative repeater lamp bulb. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 8

Go to Step 7

6

Locate and repair an open or high resistance in the ground circuit of the inoperative repeater lamp. Refer to Wiring Repairs .

Did you complete the repair?

Go to Step 8

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7

Replace the inoperative repeater lamp bulb. Refer to Front Side Marker Lamp Bulb Replacement .

Did you complete the replacement?

Go to Step 8

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8

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2