Key Switch (Insert) Check

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

CHECK KEY SWITCH INPUT SIGNAL

With CONSULT-II

Check key switch "KEY ON SW" in DATA MONITOR mode with CONSULT-II. Refer to "DATA MONITOR ".

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

Fig 1: Display Data Monitor Mode
Courtesy of NISSAN MOTOR CO., U.S.A.

Without CONSULT-II

Check voltage between BCM connector M18 terminal 37 and ground.

BCM CONNECTOR TERMINAL AND GROUND VOLTAGE SPECIFICATIONS

Connector	Terminal		Condition	Voltage (V)
Connector	(+)	(-)	Condition	Voltage (V)
M18	37	Ground	Key is inserted.	Battery voltage
M18	37	Ground	Key is removed.	0

Fig 2: Checking Voltage Between BCM Connector M18 Terminal 37 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 (INSERT)

Turn ignition switch OFF.
Disconnect key switch connector.

Check continuity between key switch terminals.

KEY SWITCH TERMINALS CONTINUITY CONDITIONS

Terminals	Condition	Continuity
1 - 2	Key is inserted.	Yes
1 - 2	Key is removed.	No

OK or NG

OK: Repair or replace harness.
NG: Replace key switch.

Fig 3: Checking Continuity Between Key Switch Terminals
Courtesy of NISSAN MOTOR CO., U.S.A.