Check BCM Power Supply and Ground Circuit

WARNING: This page is about a different car, the 2008 Infiniti M45 and 2008 Infiniti M35. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FUSES AND FUSIBLE LINK

Check for blown fuses and fusible link.

FUSES AND FUSIBLE LINK DESCRIPTION

Unit	Power source	Fuse and fusible link No.
BCM	Battery	F
	Battery	21
	Ignition switch ON or START position	1
	Ignition switch ACC or ON position	6

Refer to "WIRING DIAGRAM - H/LAMP - ".

OK or NG

OK: GO TO 2.

NG: If fuse or fusible link is blown, be sure to eliminate cause of malfunction before installing new fuse or fusible link. 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.

VOLTAGE SPECIFICATIONS

Terminal			Ignition switch position
(+)		(-)	OFF	ACC	ON
BCM Connector	Terminal	(-)	OFF	ACC	ON
M1	11	Ground	Approx. 0 V	Battery voltage	Battery voltage
M1	38		Approx. 0 V	Approx. 0 V	Battery voltage
M2	42		Battery voltage	Battery voltage	Battery voltage
M2	55		Battery voltage	Battery voltage	Battery voltage

OK or NG

OK: GO TO 3.

NG: Repair harness or connector.

Fig 1: Checking Voltage Between BCM Harness Connector And Ground

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

CHECK GROUND CIRCUIT

Check continuity between BCM harness connector and ground.

CONTINUITY SPECIFICATIONS

Terminal			Continuity
BCM Connector	Terminal	Ground	Yes
M2	52	Ground	Yes

OK or NG

OK: INSPECTION END

NG: Repair harness or connector.

Fig 2: Checking Continuity Between BCM Harness Connector And Ground

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