Check Power Supply And Ground Circuit

WARNING: This page is about a different car, the 2005 Nissan Titan. 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 INSPECTION

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

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

OK or NG

OK: GO TO 2.
NG: If fuse is blown, be sure to eliminate cause of blown fuse before installing new fuse. Refer to "POWER SUPPLY ROUTING CIRCUIT ".

CHECK POWER SUPPLY CIRCUIT

Disconnect BCM connectors.

Check voltage between BCM harness connector and ground.

Fig 1: Checking Voltage Between BCM Harness Connector And Ground

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

BCM HARNESS CONNECTOR AND GROUND VOLTAGE

Terminals			Ignition switch position
(+)		(-)	OFF	ACC	ON
Connector	Terminal (Wire color)	(-)	OFF	ACC	ON
M18	38 (W/L)	Ground	0V	0V	Battery voltage
M20	70 (W/B)	Ground	Battery voltage	Battery voltage	Battery voltage

OK or NG

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

CHECK GROUND CIRCUIT

Check continuity between BCM harness connector and ground.

Fig 2: Checking Continuity Between BCM Harness Connector And Ground

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

BCM HARNESS CONNECTOR AND GROUND CONTINUITY

Terminals			Continuity
Connector	Terminal (Wire color)		Continuity
M20	67 (B)	Ground	Yes

OK or NG

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