Check Key Switch

WARNING: This page is about a different car, the 2003 Nissan Murano. However, it is still accessible from the selected car via links, so may be relevant.

CHECK KEY SWITCH INPUT SIGNAL
Check ignition key switch IGN ON SW in DATA MONITOR mode with CONSULT- II.
- When key is inserted in ignition key cylinder
  IGN KEY SW: ON
- When key is removed from ignition key cylinder
  IGN KEY SW: OFF
  
  Fig 1: Checking Ignition Key Switch in Data Monitor Mode With Consult - II
  Courtesy of NISSAN MOTOR CO., U.S.A.
Check voltage between BCM connector M37 terminal 62 (B/R) and ground.

Fig 2: Checking Voltage Between BCM Connector Terminal And Ground (1 Of 2)
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: Key switch circuit is OK.
2. NG: GO TO 2.
  
  Fig 3: Checking Voltage Between BCM Connector Terminal And Ground (2 Of 2)
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK KEY SWITCH
Check continuity between key switch connector M28 terminals 3 and 4.

Fig 4: Checking Continuity Between Key Switch Connector Terminals
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 5: Terminal Continuity
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK: Check the following.
  - 10A fuse [No. 21, located in fuse block (J/B)]
  - Harness for open or short between key switch and fuse
  - Harness for open or short between BCM and key switch
2. NG: Replace key switch.