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 cylinder switch "KEY ON SW " in "DATE 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
Courtesy of NISSAN MOTOR CO., U.S.A.

Without CONSULT-II

Check voltage between BCM connector and ground.

TERMINALS VOLTAGE REFERENCE

Connector	Terminals (Wire color)		Condition	Voltage [V] (Approx.)
Connector	(+)	(-)	Condition	Voltage [V] (Approx.)
M1	37 (B/P)	Ground	Key is inserted	Battery voltage
M1	37 (B/P)	Ground	Key is removed	0

OK or NG

OK: Key switch circuit is OK.

NG: GO TO 2.

Fig 2: Identifying Voltage Between BCM Connector And Ground

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

CHECK KEY SWITCH

Disconnect key switch connector.

Check continuity between key switch terminals 1 and 2.

TERMINALS CONTINUITY REFERENCE

Connector	Terminals		Condition	Continuity
M25	1	2	Key is inserted	Yes
M25	1	2	Key is removed	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.