Check Key Switch

WARNING: This page is about a different car, the 2003 Infiniti G35. However, it is still accessible from the selected car via links, so may be relevant.

CHECK KEY SWITCH INPUT SIGNAL
Check voltage between BCM connector M3 terminal 62 (B/P) and ground.

Fig 1: BCM Connector M3 Terminal 62 (B/P) And Ground Check Table
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 2: Checking Voltage Between BCM Connector M3 Terminal 62 (B/P) And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
1. OK : Key switch circuit is OK.
2. NG : GO TO 2.
CHECK KEY SWITCH
1. Disconnect key switch connector.
2. Check continuity between key switch terminals 1 and 2.
  
  Fig 3: Key Switch Terminals 1 And 2 Continuity Check Table
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 4: Checking Continuity Between Key Switch Terminals 1 And 2
  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.