Check Power Supply And Ground Circuit

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

BLOWN FUSES SPECIFICATION

Unit	Power source	Fuse No.
BCM	Battery	g
BCM	Ignition switch ON or START position	1
IPDM E/R	Battery	53
IPDM E/R	Battery (Fog lamps ON)	56

Refer to "WIRING DIAGRAM - F/FOG - ".

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.

IGNITION SWITCH POSITION CHART

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

OK or NG

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

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.

TERMINAL CONTINUITY CHART

BCM		(-)	Continuity
Connector	Terminal	(-)	Continuity
M20	67	Ground	Yes

OK or NG

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

Fig 2: Checking Continuity Between BCM Harness Connector And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.