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

Turn the headlamp switch to the PARK position.

Do the park lamps operate properly?

Go to Step 4

Go to Park Lamps Inoperative

4

  1. Remove one of the marker lamps.
  2. Connect a test lamp between the fused exterior park lamps feed circuit and a good ground.

Does the test lamp illuminate?

Go to Step 5

Go to Step 6

5

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

Does the test lamp illuminate?

Go to Step 8

Go to Step 7

6

Repair the open in the fused exterior park lamps feed circuit between the I/P wiring harness junction block and splice S200. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 5

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7

Repair the open ground circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 9

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8

Replace all of the lamps.

Did you complete the repair?

Go to Step 9

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9

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3