Check Key Switch

WARNING: This page is about a different car, the 2004 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 switch "KEY ON SW" in "DATA MONITOR" mode with CONSULT-II.

When key is inserted in ignition key cylinder
KEY ON SW: ON
When key is removed from ignition key cylinder
KEY ON SW: OFF

Fig 1: Displaying DATA MONITOR Mode On Consult-II Screen
Courtesy of NISSAN MOTOR CO., U.S.A.

Without CONSULT-II

Check voltage between BCM connector M1 terminal 37 (B/P) and ground.

TERMINAL VOLTAGE

Terminal (Wire color)		Condition of key switch	Voltage [V] (Approx.)
(+)	(-)
37 (B/P)	Ground	Key is inserted in ignition key cylinder.	Battery voltage
37 (B/P)	Ground	Key is removed from ignition key cylinder.	0

Fig 2: Checking Key Switch Input Signal Voltage (Without CONSULT-II)

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

OK or NG

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

CHECK KEY SWITCH (WITHOUT INTELLIGENT KEY)

Turn ignition switch OFF.
Disconnect key switch connector.

Check continuity between key switch terminals 1 and 2.

TERMINAL CONTINUITY

Key switch condition	Continuity
Key switch is "ON". (Key is inserted in IGN key cylinder.)	Yes
Key switch is "OFF". (Key is removed from IGN key cylinder.)	No

Fig 3: Checking Key Switch Continuity (Without Intelligent Key)

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

OK or NG

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
NG: Replace key switch.