Check Key Switch

WARNING: This page is about a different car, the 2005 Infiniti FX45 and 2005 Infiniti FX35. 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 switch "KEY ON SW" in "DATA 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: DATA MONITOR - CONSULT II Display Mode

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

Without CONSULT-II

Check voltage between BCM connector M3 terminal 37 (B/W) and ground.

Fig 2: Checking Voltage Between BCM Connector M3 Terminal 37 (B/W) And Ground

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

VOLTAGE SPECIFICATION

Condition of ignition key cylinder	Voltage (V) Approx.
Key is inserted	Battery voltage
Key is removed	0

OK or NG

OK : Key switch circuit is OK.
NG : GO TO 2.

CHECK KEY SWITCH
1. Disconnect key switch connector.
2. Check continuity between key switch terminals 1 and 2.
Fig 3: Connector Terminal Reference Chart
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.
  - 15A fuse [No. 22, 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.