Diagnosis Procedure

WARNING: This page is about a different car, the 2013 Nissan Armada. However, it is still accessible from the selected car via links, so may be relevant.

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM - WITHOUT INTELLIGENT KEY SYSTEM ".

CHECK KEY SWITCH AND KEY LOCK SOLENOID INPUT SIGNAL

With CONSULT

Check key switch "KEY ON SW" in DATA MONITOR mode with CONSULT. Refer to "DOOR LOCK: CONSULT FUNCTION (BCM - DOOR LOCK) ".

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

Check voltage between BCM connector M18 terminal 37 and ground.

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

Fig 1: Checking Key Switch And Key Lock Solenoid Input Signal

Courtesy of NISSAN NORTH AMERICA, INC.

Is the inspection result normal?

YES: Key switch (insert) circuit is OK.

NO: GO TO 2

CHECK KEY SWITCH (INSERT)

Turn ignition switch OFF.
Disconnect key switch and key lock solenoid connector.

Check continuity between key switch and key lock solenoid terminals 3 and 4.

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

Fig 2: Checking Key Switch (Insert)

Courtesy of NISSAN NORTH AMERICA, INC.

Is the inspection result normal?

YES: GO TO 3

NO: Replace key switch and key lock solenoid.

CHECK KEY SWITCH AND KEY LOCK SOLENOID CIRCUIT
1. Disconnect BCM.
2. Check continuity between the BCM harness connector M18 terminal 37 and key switch and key lock solenoid harness connector M27 terminal 4.
3. Check continuity between BCM harness connector M18 terminal 37 and ground.
  37 - 4: Continuity should exist
  
  37 - Ground: Continuity should not exist
  
  Fig 3: Checking Key Switch & Key Lock Solenoid Circuit
  Courtesy of NISSAN NORTH AMERICA, INC.
  
  Is the inspection result normal?
  
  YES: Check the following:
  - 10A fuse [No. 3, located in fuse block (J/B)]
  - Harness for open or short between key switch and key lock solenoid and fuse
  NO: Repair or replace harness.