4. Check Harness Continuity

1. Disconnect key switch connector.
2. Check continuity between A/T device (detention switch) connector M97 terminal 6 and key switch and key lock solenoid connector M64 terminal 4.
   1. 6 (PU/W) - 4 (PU/W) : Continuity should exist, 
3. Check continuity between detention switch connector M97 terminal 6 and ground.
   1. 6 (PU/W) - Ground : Continuity should not exist  .

OK or NG 

1. OK : GO TO 5.
2. NG : Repair or replace harness.

Fig 1: Checking Harness Continuity

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