1. Check Power Supply Circuit

1. Turn ignition switch OFF.
2. Disconnect auto trunk control unit connector.
3. Check voltage between auto trunk control unit harness connnector B111 terminal 17 and ground.
   1. 17 (PU) - Ground : Battery voltage 

OK or NG 

1. OK : GO TO 2.
2. NG : Check the following.
   • 20A fuse [No. 15, located in fuse block (J/B) No. 1]
   • Harness for open or short between auto trunk control unit and fuse.

Fig 1: Checking Power Supply circuit

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