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 backup lamps are inoperative.

Does the system operate normally?

Go to Testing for Electrical Intermittents in Wiring Systems

Go to Step 3

3

Test for battery positive voltage at the backup lamp switch or the park/neutral position switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and complete the repair?

Go to Step 8

Go to Step 4

4

Test for battery positive voltage at the backup lamp side of the backup lamp switch or the park/neutral position switch. Refer to Circuit Testing in Wiring Systems.

Is voltage present?

Go to Step 5

Go to Step 7

5

Test for battery positive voltage at the backup lamp supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and complete the repair?

Go to Step 8

Go to Step 5

6

Repair the open or high resistance in the backup lamp 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 backup lamp switch/park neutral position switch. Refer to Park/Neutral Position Switch Replacement or Backup Lamp Switch Replacement .

Did you complete the replacement?

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