Illumination Control Signal Check

WARNING: This page is about a different car, the 2003 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.

ILLUMINATION CONTROL SIGNAL CHECK
1. Turn ignition switch ON.
2. Check voltage between AV and NAVI control unit and ground.
  
  Fig 1: Testing AV & NAVI Control Unit Illumination Control Signal
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG

OK >> Replace AV and NAVI control unit.

NG >> Check harness for open or short between AV and NAVI control unit and BCM.

Fig 2: Checking Voltage Between AV & NAVI Control Unit And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.