Check BCM Power Supply and Ground Circuit

1. CHECK FUSES 

   Check for blown fuses.

   FUSES LINK CHART
   
   

   Unit	Power source	Fuse and fusible link No.
   BCM	Battery	F
   		18
   	Ignition switch ON or START position	1
   	Ignition switch ACC or ON position	6

   Refer to "WIRING DIAGRAM - H/LAMP - ".

   OK or NG 

   OK: GO TO 2.

   NG: If fuse or fusible link is blown, be sure to eliminate cause of malfunction before installing new fuse or fusible link. Refer to "POWER SUPPLY ROUTING CIRCUIT ".

2. CHECK POWER SUPPLY CIRCUIT 
   1. Turn ignition switch OFF.
   2. Disconnect BCM connector.
   3. Check voltage between BCM harness connector and ground.
   POWER SUPPLY CIRCUIT CHART
   
   

   Terminal			Ignition switch position
   (+)		(-)	OFF	ACC	ON
   BCM Connector	Terminal
   M1	11	Ground	Approx. 0V	Battery voltage	Battery voltage
   	38		Approx. 0V	Approx. 0V	Battery voltage
   M2	42		Battery voltage	Battery voltage	Battery voltage
   	55		Battery voltage	Battery voltage	Battery voltage

   Fig 1: Checking Voltage Between BCM Harness Connector And Ground

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

   OK or NG 

   OK: GO TO 3.

   NG: Check harness for open or short between BCM and fuse.

3. CHECK GROUND CIRCUIT 

Check continuity between BCM harness connector and ground.

OK or NG 

OK: INSPECTION END

NG: Check harness ground circuit.

Fig 2: Checking Continuity Between BCM Harness Connector And Ground

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