Check Power Supply And Ground Circuit

WARNING: This page is about a different car, the 2004 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-out fuses or fusible link.

POWER SOURCE UNIT SPECIFICATION

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 malfunction before installing new fuse. Refer to POWER DISTRIBUTION .

POWER SUPPLY CIRCUIT

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

TERMINALS CONDITION SPECIFICATION

Terminals			Ignition switch position
(+)		(-)	OFF	ACC	ON
Connector	Terminal (Wire color)	(-)	OFF	ACC	ON
M18	38 (W/L)	Ground	0 V	0 V	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.

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.

TERMINALS CONDITION SPECIFICATION

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

OK or NG

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

Fig 2: Checking Ground Circuit

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