3. Check Key Switch Signal Circuit

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. 

Fig 1: Checking Continuity Between Key Switch And Ignition Knob Switch Connector M22 Terminal And BCM Connector M3 Terminal 37

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

OK or NG

OK : Key switch (BCM input) circuit is OK.

NG : Repair or replace harness between key switch and ignition knob switch and BCM.