GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics

1

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

Go to Step 2

Go to Exterior Lighting Systems Description and Operation

2

Verify that the tail lamps are inoperative.

Do the tail lamps operate normally?

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

Go to Step 3

3

Inspect the inoperative bulb and socket for the following:

    • An open filament
    • Shorted terminals
    • Poor terminal contact

Was a problem found?

Go to Step 9

Go to Step 4

4

Inspect LR PARK and RR PARK fuses in underhood fuse block.

Are the fuses good?

Go to Step 5

Go to Step 6

5

Test for an open or high resistance in the inoperative rear park lamps supply voltage circuit. Refer to Circuit Testing in wiring systems.

Was a problem found?

Go to Step 7

Go to Step 8

6

Repair the short to ground in the inoperative rear park lamps supply voltage circuit. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 10

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7

Repair the open or high resistance in the inoperative rear park lamps supply voltage circuit. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 10

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8

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

Is the repair complete?

Go to Step 10

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9

Replace the inoperative bulb or socket.

Is the repair complete?

Go to Step 10

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10

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3