Check Key Switch

WARNING: This page is about a different car, the 2005 Infiniti G35. However, it is still accessible from the selected car via links, so may be relevant.

CHECK KEY SWITCH INPUT SIGNAL
With CONSULT-II

Check ignition key cylinder switch "KEY ON SW" in "DATE MONITOR" mode with CONSULT-II
- When key is inserted in ignition key cylinder
  1. KEY ON SW: ON
- When key is removed from ignition key cylinder
  1. KEY ON SW: OFF
  Fig 1: Checking Ignition Key Cylinder Switch "KEY ON SW" In "DATE MONITOR" Mode With CONSULT-II
  Courtesy of NISSAN MOTOR CO., U.S.A.
Without CONSULT-II

Check voltage between BCM connector and ground.

Fig 2: Connector, Terminal & Condition Reference Chart
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 37 & Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK KEY SWITCH
1. Disconnect key switch connector.
2. Check continuity between key switch terminals 1 and 2.
  
  Fig 4: Connector, Terminal & Condition Reference Chart
  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
    
    Fig 5: Checking Continuity Between Key Switch Terminals 1 & 2
    Courtesy of NISSAN MOTOR CO., U.S.A.
2. NG: Replace key switch.