2. Check Harness Continuity

1. Turn ignition switch OFF.
2. Disconnect auto trunk control unit and trunk lid opener switch connector.
3. Check continuity between auto trunk control unit connector B110 terminal 6 and trunk lid and fuel lid opener switch connector D9 terminal 3.
   1. 6 (Y/R) - 3 (Y/R) : Continuity should exist  .
4. Check continuity between auto trunk control unit connector B110 terminal 6 and ground.
   1. 6 (Y/R) - Ground : Continuity should not exist  .

OK or NG 

1. OK : GO TO 3.
2. NG : Repair or replace harness between auto trunk control unit and auto trunk motor.

Fig 1: Checking Harness Continuity

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