Inspection For 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 FUSE AND FUSIBLE LINK

Check for blown BCM fuse or fusible link.

FUSE AND FUSIBLE LINK SPECIFICATION

Unit	Power source	Fuse or fusible link No.
BCM	Battery	g
BCM	Ignition switch ON or START	1

Refer to "WIRING DIAGRAM - CHIME - ".

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

Disconnect BCM connectors M18 and M20.

Check voltage between BCM harness connector terminals and ground.

TERMINALS VOLTAGE CHART

Terminals			Ignition switch position
(+)		(-)	OFF	ACC	ON
Connector	Terminal	(-)	OFF	ACC	ON
M20	70	Ground	Battery voltage	Battery voltage	Battery voltage
M18	38	Ground	0V	0V	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 Terminals And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between BCM harness connector M20 terminal 67 and ground.
  Continuity should exist.
OK or NG
1. OK : Inspection End.
2. NG : Repair harness or connector.
  
  Fig 2: Checking Continuity Between BCM Harness Connector M20 Terminal 67 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.