3. Check Ground Circuit

1. Turn ignition switch OFF.
2. Check continuity between AV control unit harness connector M78 terminals 1 (B), 4 (B) and ground.

Fig 1: Checking Ground Circuit

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

Continuity should exist. 

OK or NG

1. OK: Inspection end.
2. NG: Repair harness or connector.