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

Fig 1: BCM Power Supply And Ground Circuit - Fuse And Fusible Link Chart
Courtesy of NISSAN MOTOR CO., U.S.A.

NOTE: Refer to "COMPONENT PARTS AND HARNESS CONNECTOR LOCATION ".

OK or NG
1. OK: GO TO 2.
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 connectors M18, M20 terminals 11, 38, 57, 70 and ground.
  
  Fig 2: BCM Connectors M18, M20 And Ground Voltage Specifications Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 3: Checking Voltage Between BCM Connectors M18, M20 Terminals 11, 38, 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 4: BCM Connector M20 And Ground Continuity Chart
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 5: 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.