BCM: Diagnosis Procedure

1. CHECK FUSE AND FUSIBLE LINK

   Check if the following BCM fuses or fusible link are blown.

   FUSE AND FUSIBLE LINK REFERENCE
   
   

   Terminal No.	Signal name	Fuse and fusible link No.
   1	Battery power supply	H
   11		10
   24		7

   Is the fuse or fusible link blown? 

   YES: Replace the blown fuse or fusible link after repairing the affected circuit.

   NO: GO TO 2

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

   Terminals			Voltage (Approx.)
   (+)		(-)
   BCM		Ground
   Connector	Terminal
   M16 (A)	1		Battery voltage
   M17 (B)	11
   M18 (C)	24

   Fig 1: Checking Voltage Between BCM Harness Connector And Ground

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

   Is the measurement normal? 

   YES: GO TO 3

   NO: Repair or replace harness.

3. CHECK GROUND CIRCUIT

Check continuity between BCM harness connector and ground.

Does continuity exist? 

YES: Inspection End.

NO: Repair or replace harness.

Fig 2: Checking Continuity Between BCM Harness Connector And Ground

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