Check Key Switch

WARNING: This page is about a different car, the 2008 Infiniti FX45 and 2008 Infiniti FX35. However, it is still accessible from the selected car via links, so may be relevant.

CHECK KEY SWITCH INPUT SIGNAL

With CONSULT-III

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

When key is inserted in 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 M3 terminal 37 (B/W) and ground.

Fig 1: Identifying Voltage Between BCM Connector And Ground

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

KEY SWITCH INPUT SIGNAL (WITHOUT CONSULT-III)

Condition of ignition key cylinder	Voltage (V) Approx.
Key is inserted	Battery voltage
Key is removed	0

OK or NG

OK: Key switch circuit is OK.

NG: GO TO 2.

CHECK KEY SWITCH

Disconnect key switch connector.

Check continuity between key switch terminals 1 and 2.

Fig 2: Identifying Continuity Between Key Switch Terminals 1 And 2

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

KEY SWITCH

Terminal		Key switch condition	Continuity
1	2	Key is inserted in IGN key cylinder.	Yes
1	2	Key is removed from IGN key cylinder	No

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.