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: CONSULT-II DATA MONITOR Display Screen
  Courtesy of NISSAN MOTOR CO., U.S.A.
Check voltage between BCM connector M37 terminal 62 (B/R) and ground.

Fig 2: Terminal Voltage Based On Conditions
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 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK KEY SWITCH
Check continuity between key switch connector M28 terminals 3 and 4.

Fig 4: Terminal Continuity Based On Conditions
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.
  
  Fig 5: Checking Continuity Between Key Switch Connector Terminals
  Courtesy of NISSAN MOTOR CO., U.S.A.