Check Key Switch

WARNING: This page is about a different car, the 2004 Infiniti G35. However, it is still accessible from the selected car via links, so may be relevant.

Check key switch input signal .

Without CONSULT-II

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

Fig 1: Displaying CONSULT II DATA MONITOR Screen

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

When key is inserted in ignition key cylinder
1. KEY ON SW: ON
When key is removed from ignition key cylinder
1. KEY ON SW: OFF

Without CONSULT-II

Check voltage between BCM connector M3 terminal 37 (B/P) and ground.

Fig 2: Checking Voltage Between BCM Connector & Ground

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

DOOR SWITCH VOLTAGE

Condition Of Key Switch	Voltage (Approx.)
Key Switch On (Key Inserted In Ignition Key Cylinder)	Battery Voltage
Key Switch Off (Key Removed From Ignition Key Cylinder)	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 terminal 1 and 2.

Fig 3: Checking Key Switch Continuity

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

KEY SWITCH CONTINUITY

Condition Of Key Switch	Continuity
Key Switch Is On (Key Is Inserted In Ignition Key Cylinder)	Yes
Key Switch Is Off (Key Is Removed From Ignition Key Cylinder)	No

OK or NG

OK: Check the following.
- 15A 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.