Check Key Switch (BCM Input)

1. Turn ignition knob OFF position.
2. Disconnect key switch and ignition knob switch connector.
3. Check voltage between key switch and ignition knob switch connector M22 terminal 3 (L/R) and ground.
   1. 3 (L/R) - Ground : Battery voltage. 

OK or NG 

1. OK : GO TO 2.
2. NG : Check harness between key switch and ignition knob switch and fuse.

Fig 1: Checking Voltage Between Key Switch And Ignition Knob Switch Connector M22 Terminal 3 (L/R) And Ground

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

Check continuity between key switch and ignition knob switch as follows.

Fig 2: Connector Terminal Reference Chart

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

Fig 3: Checking Continuity Between Key Switch And Ignition Knob Switch

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

OK or NG 

1. OK : GO TO 3.
2. NG : Replace key switch and ignition knob switch.

1. Disconnect key switch and ignition knob switch connector and BCM connector.
2. Check continuity between key switch and ignition knob switch connector M22 terminal 4 (B/W) and BCM connector M3 terminal 37 (B/W).
   1. 4 (B/W) - 37 (B/W) : Continuity should exist. 
3. Check continuity between key switch and ignition knob switch connector M22 terminal 4 (B/W) and ground.
   1. 4 (B/W) - Ground : Continuity should not exist. 

OK or NG 

1. OK : Key switch (BCM input) circuit is OK.
2. NG : Repair or replace harness between key switch and ignition knob switch and BCM.

Fig 4: Checking Key Switch Signal Circuit

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