Schematic Reference: Exterior Lights Schematics

Connector End View Reference: Master Electrical Component List in Wiring Systems

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

1. Turn ON the ignition, with the engine OFF.
2. Depress and hold the brake pedal.
3. Place the gear selector in the REVERSE position.
4. Observe the backup lamps.

Do both backup lamps illuminate?

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

Go to Step 3

Is only one backup lamp inoperative?

Go to Step 7

Go to Step 4

1. Turn OFF the ignition.
2. Disconnect the reverse lamp relay. Refer to Relay Replacement in Wiring Systems.
3. Turn ON the ignition, with the engine OFF.
4. Probe the reverse lamp relay control side voltage supply circuit with a test lamp that is connected to ground.

Does the test lamp illuminate?

Go to Step 5

Go to Step 8

1. Turn OFF the ignition.
2. Connect a test lamp between the reverse lamp relay control side voltage supply circuit and the backup lamp relay control circuit.
3. Turn ON the ignition, with the engine OFF.
4. Depress and hold the brake pedal.
5. Place the gear selector in the REVERSE position.

Does the test lamp illuminate?

Go to Step 6

Go to Step 10

1. Turn OFF the ignition.
2. Connect a 15-amp fused jumper between the reverse lamp relay control side voltage supply circuit and the backup lamps supply voltage circuit.
3. Turn ON the ignition, with the engine OFF.

Do the backup lamps illuminate?

Go to Step 11

Go to Step 7

Locate and repair an open or high resistance in the backup lamp voltage supply circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 16

Go to Step 12

Locate and repair an open or high resistance in the reverse lamp relay control side voltage supply circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 16

Go to Step 9

Inspect for poor connections at the C3 harness connector of the underhood fuse block. 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 16

Go to Step 14

Inspect for poor connections at the harness connector of the body control module (BCM). 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 16

Go to Step 15

Inspect for poor connections at the reverse lamp relay. 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 16

Go to Step 13

Locate and repair an open or high resistance in the backup lamp ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 16

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Replace the reverse lamp relay. Refer to Relay Replacement in Wiring Systems.

Did you complete the repair?

Go to Step 16

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

Did you complete the repair?

Go to Step 16

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Replace the BCM. Refer to Body Control Module Replacement in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 16

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2