Check Power Supply And Ground Circuit

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 FUSES

Check for blown fuses.

FUSES REFERENCE CHART

Unit	Power source	Fuse and fusible link No.
BCM	Battery	M
	Battery	22
	Ignition switch ON or START position	1
	Ignition switch ACC or ON position	6
IPDM E/R	Battery	71
		72
		74
		76
		86

Refer to "WIRING DIAGRAM - AUTO/L - ".

OK or NG

OK: GO TO 2.

NG: If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse. Refer to "POWER SUPPLY ROUTING CIRCUIT ".

CHECK POWER SUPPLY CIRCUIT

Turn ignition switch OFF.
Disconnect BCM connector.
Check voltage between BCM harness connector and ground.

Fig 1: Identifying Voltage Between BCM Connector And Ground

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

POWER SUPPLY CIRCUIT

(+)		(-)	Ignition switch position
BCM connector	Terminal	(-)	OFF	ACC	ON
M3	11	Ground	Approx. 0 V	Battery voltage	Battery voltage
M3	38		Approx. 0 V	Approx. 0 V	Battery voltage
M4	42		Battery voltage	Battery voltage	Battery voltage
M4	55		Battery voltage	Battery voltage	Battery voltage

OK or NG

OK: GO TO 3.

NG: Repair harness or connector.

CHECK GROUND CIRCUIT

Check continuity between BCM harness connector and ground.

Fig 2: Identifying Continuity Between BCM Connector And Ground

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

GROUND CIRCUIT

BCM connector	Terminal	Ground	Continuity
M4	49		Yes
M4	52		Yes

OK or NG

OK: INSPECTION END

NG: Repair harness or connector.