Check Power Supply And Ground Circuit

WARNING: This page is about a different car, the 2006 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FUSES OR FUSIBLE LINK

Check for blown fuses or fusible link.

FUSES OR FUSIBLE LINK REFERENCE

Unit	Power source	Fuse and fusible link No.
BCM	Battery	f
BCM	Ignition switch ON or START position	59
IPDM E/R	Battery	34
		35
		37
		40
		41
		53

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

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

Disconnect BCM connectors.

Check voltage between BCM harness connector and ground.

IGNITION SWITCH POSITION

BCM			Ignition switch position
(+)		(-)	OFF	ACC	ON
Connector	Terminal	(-)	OFF	ACC	ON
M18	38	Ground	0V	0V	Battery voltage
M20	70	Ground	Battery voltage	Battery voltage	Battery voltage

Fig 1: Identifying Voltage Between BCM Harness Connector And Ground

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

OK or NG

OK : GO TO 3.
NG : Check harness for open between BCM and fuse or fusible link.

CHECK GROUND CIRCUIT

Check continuity between BCM harness connector and ground.

BCM CONTINUITY REFERENCE

BCM			Continuity
Connector	Terminal		Continuity
M20	67	Ground	Yes

Fig 2: Identifying Continuity Between Ground And BCM Connector Terminal 67

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

OK or NG

OK : Inspection End.
NG : Check ground circuit harness.