Diagnosis Procedure

WARNING: This page is about a different car, the 2012 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM ".

CHECK FUSE
Check if the key switch and ignition knob switch 10A fuse (No. 31, located in the fuse and fusible link box) is blown.

Is the fuse blown?

YES: Be sure to repair the cause of malfunction before installing new fuse.

NO: GO TO 2

CHECK BCM INPUT SIGNAL

Check voltage between BCM harness connector M18 terminal 37 and ground.

Terminals			Condition	Voltage (Approx.)
(+)		(-)
BCM connector	Terminal	(-)
M18	37	Ground	Key is inserted	Battery voltage
M18	37	Ground	Key is removed	0

Fig 1: Checking Voltage Between BCM Harness Connector M18 Terminal 37 And Ground

Courtesy of NISSAN NORTH AMERICA, INC.

Is the inspection result normal?

YES: Inspection End.

NO: GO TO 3

CHECK KEY SWITCH CIRCUIT

Disconnect BCM connector M18 and key switch and ignition knob switch connector.

Check continuity between BCM harness connector M18 (A) terminal 37 and key switch and ignition knob switch harness connector M66 (B) terminal 4.

BCM		Key switch and ignition knob switch		Continuity
Connector	Terminal	Connector	Terminal	Continuity
M18 (A)	37	M66 (B)	4	Yes

Check continuity between BCM harness connector M18 (A) terminal 37 and ground.

Fig 2: Checking Continuity Between BCM Connector M18 Terminal 37 And Key Switch And Ignition Knob Switch Connector M66 Terminal 4

Courtesy of NISSAN NORTH AMERICA, INC.

BCM		Ground	Continuity
Connector	Terminal
M18 (A)	37		No

Is the inspection result normal?

YES: GO TO 4

NO: Repair harness or connector.

CHECK KEY SWITCH POWER SUPPLY CIRCUIT

Check voltage between key switch and ignition knob switch harness

connector M66 terminal 3 and ground.

Terminals			Voltage (Approx.)
(+)		(-)
Key switch and ignition knob switch connector	Terminal	(-)
M66	3	Ground	Battery voltage

Fig 3: Checking Voltage Between Key Switch And Ignition Knob Switch Connector M66 Terminal 3 And Ground

Courtesy of NISSAN NORTH AMERICA, INC.

Is the inspection result normal?

YES: Replace key switch and ignition knob switch.

NO: Repair harness or connector.