2. Check Harness Continuity

1. Turn ignition switch OFF.
2. Disconnect auto trunk control unit and A/T device (detention switch) connector.
3. Check continuity between auto trunk control unit connector B110 terminal 3 and A/T device (detention switch) connector M97 terminal 7.
   1. 3 (G/OR) - 7 (G/OR) : Continuity should exist  .
4. Check continuity between auto trunk control unit connector B110 terminal 3 and ground.
   1. 3 (G/OR) - Ground : Continuity should not exist  .

OK or NG 

1. OK : GO TO 3.
2. NG : Repair or replace harness.

Fig 1: Checking Harness Continuity

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