BCM Power Supply and Ground Circuit Check

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

CHECK FUSE

Check the following BCM fuse and fusible link.

FUSE CHECKING

Component Parts	Terminal No. (SIGNAL)	Ampere	No.	Location
BCM	38 (IGN power supply)	10A	16	Fuse block (J/B)
BCM	55 (BAT power supply)	50A	j	Fuse and fusible link box

NOTE: Refer to "Component Parts and Harness Connector Location ".

OK or NG

OK: GO TO 2.
NG: If fuse is blown, be sure to eliminate cause of problem before installing new fuse, refer to "For references in wiring diagrams to PG-POWER, see POWER DISTRIBUTION or GROUND DISTRIBUTION ".

CHECK POWER SUPPLY CIRCUIT

Turn ignition switch OFF.
Disconnect BCM.
Check voltage between BCM connector M19 terminals 42, 55 and ground.

BCM CONNECTOR TERMINALS VOLTAGE

Connector	Terminals (Wire color)		Voltage (V) (Approx.)
	(+)	(-)
M18	38 (R)	Ground	Battery voltage
M19	55 (W/B)

OK or NG

OK: GO TO 3.
NG: Repair or replace harness.

Fig 1: Checking Voltage Between BCM Connector M19 Terminals 42, 55 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

CHECK GROUND CIRCUIT

Check continuity between BCM connector M19 terminals 49, 52 and ground.

BCM CONNECTOR TERMINALS CONTINUITY

Connector	Terminals (Wire color)		Continuity
	(+)	(-)
M19	49 (B)	Ground	YES
	52(B/W)

OK or NG

OK: Power supply and ground circuit is OK.
NG: Repair or replace harness.

Fig 2: Checking Continuity Between BCM Connector M19 Terminals 49, 52 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.