GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2000 🢒 Savana 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Backup Lamps Inoperative

Step

Action

Value(s)

Yes

No

1

Review the backup lamps operation and perform the necessary inspections.

Did you complete the system review and inspection?

--

Go to Step 2

Go to Symptoms

2

Attempt to operate the backup lamps.

Does the system operate normally?

--

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

Go to Step 3

3
  1. Block the wheels and apply the park brake to prevent the vehicle from moving.
  2. Turn the ignition ON with the engine off.
  3. Place the transmission in the REVERSE position.
  4. Remove one of the backup lamps and test for voltage at cavity A of the backup lamp socket.

Is battery voltage available at cavity A of the backup lamp socket?

B+

Go to Step 9

Go to Step 4

4

Test for voltage at connector C1 cavity C of the backup lamp switch.

Is battery voltage available at connector C1 cavity C of the backup lamp switch?

B+

Go to Step 6

Go to Step 5

5
  1. Turn off the ignition.
  2. Place the transmission in the PARK position.
  3. Repair the open voltage supply circuit to the backup lamp switch (CKT 139 PNK).

Did you complete the repair?

--

Go to Step 10

--

6

Disconnect the backup lamp switch and place a fused jumper with a 20A fuse between cavities C and F of the backup lamp switch connector C1.

Do the backup lamps turn on?

--

Go to Step 7

Go to Step 8

7
  1. Turn off the ignition.
  2. Place the transmission in the PARK position.
  3. Replace or adjust the park/ neutral position switch. Refer to the following:

Did you complete the repair?

--

Go to Step 10

--

8
  1. Turn off the ignition.
  2. Place the transmission in the PARK position.
  3. Repair the open circuit between the backup lamp switch and the backup lamps (CKT 24 LT GRN).

Did you complete the repair?

--

Go to Step 10

--

9
  1. Turn off the ignition.
  2. Place the transmission in the PARK position.
  3. Repair the ground circuit for the backup lamp (CKT 150 BLK).

Did you complete the repair?

--

Go to Step 10

--

10

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3