GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

  1. Turn the ignition to the RUN position.
  2. Turn the park lamps on.

Do the park/turn lamps illuminate?

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

Go to Step 3

3

  1. Cover the DRL ambient light sensor.
  2. Turn the ignition switch to the RUN position.
  3. Connect a test lamp between the inoperative park/turn lamp terminal A and terminal G. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

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Go to Step 4

Go to Step 5

4

Replace the inoperative lamp. Refer to Parking and Turn Signal Lamp Replacement .

Did you complete the replacement?

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Go to Step 8

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5

Connect a test lamp between the inoperative turn lamp terminal A and ground. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

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Go to Step 6

Go to Step 7

6

Repair a poor connection or an open in the ground circuit. Refer to Wiring Repairs or Connector Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 8

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7

Repair a poor connection or an open in the supply voltage circuit of the park/turn signal lamp. Refer to Wiring Repairs or Connector Repairs in Wiring Systems.

Did you complete the repair?

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Go to Step 8

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8

Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 3