GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics

1

Did you perform the Lighting Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

Verify the fault is present.

Does the system operate normally?

Go to Testing for Electrical Intermittents in Wiring Systems

Go to Step 3

3

  1. Turn the ignition OFF.
  2. Remove the left rear turn signal lamp and inspect the filament.

Is the filament open?

Go to Step 7

Go to Step 4

4

Connect a test lamp between the lamp ground circuit and a battery positive voltage circuit.

Does the test lamp illuminate?

Go to Step 6

Go to Step 5

5

Repair the open in the fuse turn signal lamp feed circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 8

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6

Repair the open in the fused turn signal lamp feed circuit between the lamp and the engine wiring harness junction block. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 8

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7

Replace the open lamp. Refer to Tail/Turn Signal Lamp 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 3