2. Check Ground Circuit

Check continuity between auto trunk control unit harness connector B111 terminal 18 and ground.

1. 18 (B) - Ground : Continuity should exist  .

OK or NG 

1. OK : Auto trunk control unit power supply and ground circuit is OK.
2. NG : Repair or replace harness.

Fig 1: Checking Ground Circuit

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