GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics

1

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

Go to Step 2

Go to Symptoms - Lighting Systems

2

Verify that the turn signal lamps and/or indicators are inoperative.

Does the system operate normally?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

Test cavity 6 of the turn signal/headlamp switch for continuity to ground. Refer to Circuit Testing .

Is a ground present?

Go to Step 4

Go to Step 5

4

Test cavity 1 of the flasher relay for battery positive voltage. Refer to Circuit Testing .

Is voltage present?

Go to Step 6

Go to Step 7

5

Repair open in the ground circuit between cavity 6 of the turn signal/headlamp switch and G200. Refer to Wiring Repairs .

Did you complete the repair?

Go to Step 8

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6

Replace the flasher relay.

Did you complete the repair?

Go to Step 8

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7

Repair open or short to ground in the flasher relay supply voltage circuit. Refer to Circuit Testing .

Did you complete the repair

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