Key Switch and Ignition Knob Switch (Insert) Check

WARNING: This page is about a different car, the 2008 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

CHECK KEY SWITCH AND IGNITION KNOB SWITCH INPUT SIGNAL

With CONSULT-III

Check key switch "KEY ON SW" in DATA MONITOR mode with CONSULT-III. 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

Without CONSULT-III

Check voltage between BCM connector M18 terminal 37 and ground.

BCM CONNECTOR M18 TERMINAL 37 AND GROUND

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

Fig 1: 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 AND IGNITION KNOB SWITCH (INSERT)

Disconnect key switch and ignition knob switch.
Check continuity between key switch and ignition knob switch connector terminals.

KEY SWITCH AND IGNITION KNOB SWITCH (INSERT)

Terminals	Condition	Continuity
3 - 4	Key is inserted.	Yes
3 - 4	Key is removed.	No

Fig 2: Checking Continuity Between Key Switch And Ignition Knob Switch Connector M118 Terminals 3 And 4

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

OK or NG

OK: Check the following:

10A fuse [No. 2, located in the fuse block (J/B)]
Harness for open or short between key switch and fuse.
Harness for open or short between BCM and key switch and ignition knob.

NG: Replace key switch and ignition knob switch.