GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC C Sierra - 2WD 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Backup Lamps Always On

Step

Action

Value(s)

Yes

No

1
  1. Turn the ignition ON.
  2. Turn the engine OFF.
  3. Set the park brake.
  4. Place the transmission in neutral.
  5. Disconnect the back-up lamp switch.

Are the back-up lamps on?

--

Go to Step 3

Go to Step 2

2

Replace the back-up lamp switch. Refer to the appropriate procedure in Transmission/Transaxle from the following list:

    •  Park/Neutral Position Switch Replacement . in Automatic Transmission - 4L60-E
    •  Park/Neutral Position Switch Replacement in Automatic Transmission - 4L80-E
    •  Backup Lamp Switch Replacement in Manual Transmission - NV3500
    •  Backup Lamp Switch Replacement in Manual Transmission - NV4500

Is the repair complete?

--

System OK

--

3

Remove the VEH B/U fuse.

Are the back-up lamps on?

--

Go to Step 4

Go to Step 5

4

Locate and repair CKT 1324 (LT GRN) for a short to voltage.

Is the repair complete?

--

System OK

--

5

Locate and repair CKT 24 (LT GRN) for a short to voltage.

Is the repair complete?

--

System OK

--