GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Venture Ext. 🢒 Vehicle Control Systems 🢒 Vehicle DTC Information 🢒 Backup Lamps Inoperative

Backup Lamps Inoperative Export

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics

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

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2
  1. Apply the park brake.
  2. Turn the ignition to the ON position.
  3. Place the gear shift selector lever in the REVERSE position.

Do both backup lamps illuminate?

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

Go to Step 3

3

Are both backup lamps inoperative?

Go to Step 4

Go to Step 6

4
  1. Disconnect the park/neutral position (PNP) switch harness connector.
  2. Using a test lamp connected to ground, probe the battery positive voltage supply circuit of the PNP switch.

Does the test lamp illuminate?

Go to Step 5

Go to Step 16

5

Install a fused jumper across the battery positive voltage supply circuit and the backup lamps supply voltage circuit of the PNP switch connector. Refer to Circuit Testing in Wiring Systems.

Did the backup lamps illuminate?

Go to Step 14

Go to Step 9

6
  1. Remove the inoperative backup lamp bulb.
  2. Using a test lamp, probe between the supply voltage circuit and the ground circuit of the inoperative backup lamp bulb socket.

Does the test lamp illuminate?

Go to Step 13

Go to Step 7

7
  1. Disconnect the tail lamp connector of the inoperative backup lamp.
  2. Using a test lamp connected to ground, probe the backup lamp supply voltage circuit of the tail lamp connector.

Does the test lamp illuminate?

Go to Step 8

Go to Step 17

8

Using a test lamp connected to battery positive voltage, probe the backup lamp ground circuit of the tail lamp connector.

Does the test lamp illuminate?

Go to Step 15

Go to Step 18

9
  1. Disconnect the backup lamp relay connector.
  2. Install a fused jumper between the battery positive voltage supply circuit and the backup lamp relay coil voltage supply circuit.
  3. Using a test lamp connected to ground, probe the backup lamp relay coil voltage supply circuit at the backup lamp relay connector.

Does the test lamp illuminate?

Go to Step 10

Go to Step 19

10

Using a test lamp connected to ground, probe the backup lamp relay switch side voltage supply circuit.

Does the test lamp illuminate?

Go to Step 11

Go to Step 20

11

Using a test lamp connected to battery positive voltage, probe the backup lamp relay coil side ground supply circuit.

Does the test lamp illuminate?

Go to Step 12

Go to Step 22

12

Install a fused jumper between the backup lamp relay switch side voltage supply circuit and the backup lamp relay switched voltage supply circuit.

Do the backup lamps illuminate?

Go to Step 24

Go to Step 21

13

Inspect for poor connections at the bulb socket of the inoperative backup lamp. 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 27

Go to Step 25

14

Inspect for poor connections at the harness connector of the PNP 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 27

Go to Step 23

15

Inspect for poor connections at the harness connector of the tail lamp. 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 27

Go to Step 26

16

Repair an open or high resistance in the battery positive voltage supply circuit of the PNP switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 27

--

17

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

Did you complete the repair?

Go to Step 27

--

18

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

Did you complete the repair?

Go to Step 27

--

19

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

Did you complete the repair?

Go to Step 27

--

20

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

Did you complete the repair?

Go to Step 27

--

21

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

Did you complete the repair?

Go to Step 27

--

22

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

Did you complete the repair?

Go to Step 27

--

23

Adjust or replace the PNP switch. Refer to Park/Neutral Position Switch Adjustment or Park/Neutral Position Switch Replacement in Automatic Transaxle-4T65-E.

Did you complete the repair?

Go to Step 27

--

24

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

Did you complete the repair?

Go to Step 27

--

25

Replace the inoperative backup lamp bulb.

Did you complete the repair?

Go to Step 27

--

26

Replace the inoperative tail lamp assembly. Refer to Tail Lamp Assembly and /or Backup, Sidemarker, Stop, Turn Signal Bulb Replacement .

Did you complete the repair?

Go to Step 27

--

27

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2

Backup Lamps Inoperative Domestic

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics

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

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2
  1. Turn the ignition, to the ON position.
  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 System

Go to Step 3

3

Is only one lamp inoperative?

Go to Step 7

Go to Step 4

4
  1. Disconnect the park/neutral position (PNP) switch harness connector.
  2. With a test lamp connected to ground, probe the battery positive supply voltage circuit of the PNP switch.

Does the test lamp illuminate?

Go to Step 5

Go to Step 8

5

Install a fused jumper between the PNP switch battery positive voltage supply circuit and the backup lamps voltage supply circuit.

Do the backup lamps illuminate?

Go to Step 9

Go to Step 6

6

Repair a short to ground or open in the backup lamps voltage supply circuit. Refer to Circuit Testing and Wiring Repairs in Wiring System.

Did you complete the repair?

Go to Step 10

--

7

Repair the open, or poor connection 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 10

--

8

Repair the open, or short to ground in the battery positive voltage supply circuit of the PNP switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 10

--

9

Adjust or replace the PNP switch. Refer to Park/Neutral Position Switch Adjustment or Park/Neutral Position Switch Replacement in Automatic Transaxle-4T65-E.

Did you complete the replacement?

Go to Step 10

--

10

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2