Schematic Reference: Exterior Lights Schematics

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

Go to Step 2

Go to Symptoms - Lighting Systems

Operate the backup lamps to verify the fault is present.

Does the system operate normally?

Go to Testing for Electrical Intermittents in Wiring Systems

Go to Step 3

Is only one backup lamp inoperative?

Go to Step 4

Go to Step 6

1. Remove the inoperative backup lamp.
2. Set the park brake.
3. Turn ON the ignition with the engine OFF.
4. Place the transmission in REVERSE.
5. Connect a test lamp between the backup lamp supply voltage circuit at the inoperative lamp and a good ground.

Does the test lamp illuminate?

Go to Step 5

Go to Step 14

Connect a test lamp between the backup lamp ground circuit and the backup lamp supply voltage circuit at the inoperative lamp.

Does the test lamp illuminate?

Go to Step 11

Go to Step 13

1. Turn OFF the ignition.
2. Remove and inspect the TURN B/U fuse.

Is the fuse open?

Go to Step 7

Go to Step 9

1. Disconnect the backup lamp switch.
2. Connect a test lamp between the ignition 1 voltage circuit and a battery positive voltage circuit.

Does the test lamp illuminate?

Go to Step 15

Go to Step 8

1. Remove both backup lamp bulbs.
2. Connect a test lamp between the backup lamp supply voltage circuit and a battery positive voltage circuit.

Does the test lamp illuminate?

Go to Step 16

Go to Step 12

1. Install the fuse.
2. Disconnect the backup lamp switch.
3. Turn ON the ignition with the engine OFF.
4. Connect a test lamp between the ignition 1 voltage circuit at the backup lamp switch and a good ground.

Does the test lamp illuminate?

Go to Step 10

Go to Step 17

Connect a fused jumper wire between the ignition 1 voltage and the backup lamp supply voltage circuit at the backup lamp switch connector.

Do the backup lamps illuminate?

Go to Step 12

Go to Step 20

Inspect for poor connections at the harness connector of the bulb. 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 21

Go to Step 19

Inspect for poor connections at the harness connector of the back-up lamp switch. 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 21

Go to Step 20

Repair the open in the ground circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 21

--

Repair the open in the backup lamp supply voltage circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 21

--

1. Repair the short to ground in the ignition 1 voltage circuit. Refer to Wiring Repairs in Wiring Systems.
2. Replace the fuse.

Did you complete the repair?

Go to Step 21

--

1. Repair the short to ground in the backup lamp supply voltage circuit. Refer to Wiring Repairs in Wiring Systems.
2. Replace the fuse.

Did you complete the repair?

Go to Step 21

--

Repair the open in the ignition 1 voltage circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 21

--

Repair the open in the backup lamp supply voltage circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 21

--

Replace the inoperative backup lamp bulb. Refer to Backup Lamp Bulb Replacement .

Did you complete the replacement?

Go to Step 21

--

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 21

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3

Schematic Reference: Exterior Lights Schematics

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

Go to Step 2

Go to Symptoms - Lighting Systems

Operate the backup lamps to verify the fault is present.

Does the system operate normally?

Go to Testing for Electrical Intermittents in Wiring Systems

Go to Step 3

Remove and inspect the inoperative backup lamp bulb.

Is the bulb OK?

Go to Step 4

Go to Step 11

1. Remove the inoperative backup lamp.
2. Set the park brake.
3. Turn ON the ignition with the engine OFF.
4. Place the transmission in REVERSE.
5. Connect a test lamp between the backup lamp supply voltage circuit at the inoperative lamp and a good ground.

Does the test lamp illuminate?

Go to Step 5

Go to Step 14

Connect a test lamp between the backup lamp ground circuit and the backup lamp supply voltage circuit at the inoperative lamp.

Does the test lamp illuminate?

Go to Step 6

Go to Step 13

1. Turn OFF the ignition.
2. Remove and inspect the TURN B/U fuse.

Is the fuse open?

Go to Step 7

Go to Step 9

1. Disconnect the backup lamp switch.
2. Connect a test lamp between the ignition 1 voltage circuit and a battery positive voltage circuit.

Does the test lamp illuminate?

Go to Step 15

Go to Step 8

1. Remove both backup lamp bulbs.
2. Connect a test lamp between the backup lamp supply voltage circuit and a battery positive voltage circuit.

Does the test lamp illuminate?

Go to Step 16

Go to Step 12

1. Install the fuse.
2. Disconnect the backup lamp switch.
3. Turn ON the ignition with the engine OFF.
4. Connect a test lamp between the ignition 1 voltage circuit at the backup lamp switch and a good ground.

Does the test lamp illuminate?

Go to Step 10

Go to Step 17

Connect a fused jumper wire between the ignition 1 voltage and the backup lamp supply voltage circuit at the backup lamp switch connector.

Do the backup lamps illuminate?

Go to Step 12

Go to Step 18

Inspect for a poor connection at the harness connector of the bulb. 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 21

Go to Step 19

Inspect for a poor connection at the harness connector of the backup switch. 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 21

Go to Step 20

Repair the open in the ground circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 21

--

Repair the open in the backup lamp supply voltage circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 21

--

1. Repair the short to ground in the ignition 1 voltage circuit. Refer to Wiring Repairs in Wiring Systems.
2. Replace the fuse.

Did you complete the repair?

Go to Step 21

--

1. Repair the short to ground in the backup lamp supply voltage circuit. Refer to Wiring Repairs in Wiring Systems.
2. Replace the fuse.

Did you complete the repair?

Go to Step 21

--

Repair the open in the ignition 1 voltage circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 21

--

Repair the open in the backup lamp supply voltage circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 21

--

Replace the inoperative backup lamp bulb. Refer to Backup Lamp Bulb Replacement .

Did you complete the repair?

Go to Step 21

--

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 21

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3