Ignition Signal Check

1. Disconnect the AV and NAVI control unit connector.
2. Turn ignition switch ON.
3. Check voltage between AV and NAVI control unit harness connector B29 terminal 26 (W/G) and ground.
   1. Battery voltage should exist. 

OK or NG 

1. OK >> Replace AV and NAVI control unit.
2. NG >> Check harness for open or short between AV and NAVI control unit and fuse.

Fig 1: Harness Check (Ignition Signal)

Courtesy of NISSAN MOTOR CO., U.S.A.