BCM Power Supply and Ground Circuit Check

WARNING: This page is about a different car, the 2005 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FUSE AND FUSIBLE LINK

Check the following BCM fuse and fusible link.

BCM POWER SUPPLY AND GROUND CIRCUIT CHECK

Component Parts	Terminal No. (SIGNAL)	Ampere	No.	Location
BCM	57 (BAT power supply)	15A	22	Fuse block (J/B)
BCM	70 (BAT power supply)	50A	f	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 "POWER SUPPLY ROUTING CIRCUIT ".

CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM.
3. Check voltage between BCM connector M20 terminals 57, 70 and ground.
  
  Fig 1: BCM Connector M20 Terminals And Ground Voltage Specification Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 2: Checking Voltage Between BCM Connector M20 Terminals 57, 70 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 3.
2. NG: Repair or replace harness.
CHECK GROUND CIRCUIT
Check continuity between BCM connector M20 terminal 67 and ground.

Fig 3: BCM Connector M20 And Ground Continuity Specification Chart
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 4: Checking Continuity Between BCM Connector M20 Terminal 67 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

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