Reverse Signal Check for Display Control Unit

WARNING: This page is about a different car, the 2005 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.

CHECK REVERSE LAMP
1. Turn ignition switch ON.
2. Place selector lever into R-position. Do back-up lamps come on?
YES or NO
- YES: GO TO 2.
- NO: Check back-up lamp system. Refer to "BACK-UP LAMP ".
CHECK REVERSE SIGNAL
1. Disconnect display control unit connector M94.
2. Turn ignition switch ON.
3. With the selector lever in R-position, check voltage between display control unit and ground.
  
  Fig 1: Display Control Unit Connector M94 Terminals And Ground Voltage Specifications
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 2: Checking Voltage Between Display Control Unit And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK: Replace display control unit. Refer to "REMOVAL AND INSTALLATION OF DISPLAY CONTROL UNIT ".
- NG: Check harness for open or short between display control unit and back-up lamp position relay.