Schematic Reference: Exterior Lights Schematics

Connector End View Reference: Master Electrical Component List

Did you perform the Lighting Systems Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

1. Turn ON the ignition.
2. Place the gear selector lever to the REVERSE position.

Do both backup lamps illuminate?

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

Go to Step 3

Is only one lamp inoperative?

Go to Step 12

Go to Step 4

1. Disconnect the harness connector at one of the following switches:

•	Auto: The park neutral position (PNP) switch

•	Manual: The backup lamp switch

2. Probe the ignition positive voltage supply circuit of the switch with a test lamp that is connected to ground.

Does the test lamp illuminate?

Go to Step 5

Go to Step 11

Install a fused jumper across the ignition positive voltage supply circuit and the backup lamps relay switched voltage supply circuit.

Do the backup lamps illuminate?

Go to Step 8

Go to Step 6

1. Remove the backup lamp relay #38.
2. Reconnect the park/neutral position switch or the backup switch.
3. Install a fused jumper between the backup lamps relay switched voltage supply circuit and the backup lamps voltage supply circuit
4. Place the gear selector in the REVERSE position.

Do the backup lamps illuminate?

Go to Step 13

Go to Step 7

Test the backup lamp relay switched voltage supply circuit for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 15

Go to Step 9

1. Inspect the PNP switch (auto) or the backup lamp switch (manual).
2. Adjust or replace the switch if needed. Refer to Park/Neutral Position Switch Replacement in Automatic Transaxle - 4T65E or Backup Lamp Switch Replacement in Manual Transmission.

Did you complete the repair?

Go to Step 15

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Test the backup lamp voltage supply circuit for a short to ground, or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 15

Go to Step 10

Inspect the underhood fuse block harness connectors for a poor connection or an open. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 15

Go to Step 14

Repair the open, high resistance, or short to ground in the ignition positive voltage supply circuit of the PNP switch (auto) or the backup lamp switch (manual). Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 15

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Repair the open or the high resistance in the inoperative backup lamp voltage supply circuit or the ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 15

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Replace the backup lamp relay #38. Refer to Relay Replacement in Wiring Systems.

Did you complete the repair?

Go to Step 15

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Replace the underhood fuse center. Refer to Underhood Electrical Center or Junction Block Replacement in Wiring Systems.

Did you complete the repair?

Go to Step 15

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2