Schematic Reference: Exterior Lights Schematics

Did you review the backup lamp operation and perform the necessary inspections?

Go to Step 2

Go to Exterior Lighting Systems Description and Operation in Wiring Systems

Operate the backup lamp(s) to verify the fault is present.

Does the system operate normally?

Go to Testing for Electrical Intermittents in Wiring Systems

Go to Step 3

1. Turn the ON the ignition with the engine OFF.
2. Set the park brake.
3. Place the transmission in neutral.
4. Disconnect the backup lamp switch.

Is the back-up lamp(s) on?

Go to Step 5

Go to Step 4

Inspect for poor connections at the harness connector of the back-up lamp switch.

Did you find and correct the condition?

Go to Step 7

Go to Step 6

Repair the backup lamp supply voltage circuit for a short to voltage. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 7

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Replace the backup lamp switch. Refer to Park/Neutral Position Switch Replacement in Automatic Transmission-4L60-E, or Park/Neutral Position Switch Replacement in Automatic Transmission-4L80-E.

Did you complete the replacement?

Go to Step 7

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3