Check Key Switch

WARNING: This page is about a different car, the 2006 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: Display CONSULT-II - Data Monitor Screen
Courtesy of NISSAN MOTOR CO., U.S.A.

Without CONSULT-II

Check voltage between BCM connector and ground.

TERMINALS VOLTAGE REFERENCE

Terminal (Wire color)		Condition of key switch	Voltage [V] (Approx.)
(+)	(-)	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: Identifying Voltage Between BCM Connector And Ground

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.

TERMINALS CONTINUITY REFERENCE

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: Identifying Continuity Between Key Switch Terminals 1 And 2

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

OK or NG

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
NG: Replace key switch.