Schematic Reference: Exterior Lights Schematics

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

Go to Step 2

Go to Symptoms - Lighting Systems

Verify that the back up lamps are always on.

Does the system operate normally?

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

Go to Step 3

1. Disconnect the park/neutral position (PNP) switch.
2. Shift the transaxle to the PARK position.
3. Turn the ignition switch to the ON position.

Do the backup lamps illuminate?

Go to Step 4

Go to Step 5

Adjust/replace the park/neutral position switch. Refer to Park/Neutral Position Switch Replacement in Automatic Transmission - 35 Speed - MB3.

Did you complete the repair?

Go to Step 8

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1. Disconnect the backup lamp switch.
2. Shift the transaxle to the NEUTRAL position.
3. Turn the ignition switch to the ON position.

Do the backup lamps illuminate?

Go to Step 6

Go to Step 7

Replace the backup lamp switch.

Did you complete the repair?

Go to Step 8

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Repair a short to B+ on the backup lamp feed circuit between the backup lamp switch and the SP450. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 8

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3