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 Lighting Systems Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

Verify that the clearance lamps are inoperative.

Do the clearance lamps operate normally?

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

Go to Step 3

3

Is the right tail lamp inoperative also?

Go to Step 5

Go to Step 4

4

Inspect the inoperative bulbs/sockets for open filaments or poor terminal contact.

Does any lamp have an open filament or poor terminal contact?

Go to Step 7

Go to Step 6

5

Repair one of the following conditions.

    • The short to ground in the clearance lamps supply voltage circuit or right tail lamp supply voltage circuit.
    • The open in the clearance lamps supply voltage and right tail lamp supply voltage circuits.

Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 8

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6

Repair the open or high resistance in the clearance lamps supply voltage circuit or ground circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 8

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7

Replace the inoperative bulb or repair/replace the socket. Refer to Clearance Lamp Replacement or Wiring Repairs in Wiring Systems.

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