Inspection For Power Supply And Ground Circuit

WARNING: This page is about a different car, the 2004 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FUSES AND FUSIBLE LINK

Check for blown-out fuses or fusible link.

BCM UNIT POWER SOURCE SPECIFICATION

Unit	Power source	Fuse No.
BCM	Battery	f
	Battery	21
	Ignition switch ON or START position	1
Daytime light relay	Battery	27

Refer to , "WIRING DIAGRAM - DTRL - ".

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 SYSTEM WIRING DIAGRAMS .

CHECK POWER SUPPLY CIRCUIT

Disconnect BCM connector.
Check voltage between BCM harness connector and ground.

TERMINAL IGNITION SWITCH POSITION

Terminals			Ignition switch position
(+)		(-)	OFF	ON
Connector	Terminal (Wire color)	(-)	OFF	ON
M18	38 (G)	Ground	0V	Battery voltage
M19	42 (Y/R)		Battery voltage	Battery voltage
M19	55 (W/B)		Battery voltage	Battery voltage

OK or NG

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

Fig 1: Checking Power Supply Circuit
Courtesy of NISSAN MOTOR CO., U.S.A.

CHECK GROUND CIRCUIT

Check continuity between BCM harness connector and ground.

TERMINAL CONTINUITY SPECIFICATION

Terminals			Continuity
	(+)			(-)
Connector	Terminal (Wire color)			(-)
M19	49 (B)	Ground	Yes
M19	52 (B)	Ground	Yes

OK or NG

OK: INSPECTION END.
NG: Check ground circuit harness.