BCM Power Supply and Ground Circuit Check

First perform the "SELF-DIAG RESULTS" in "BCM" with CONSULT-II, when perform the each trouble diagnosis. Refer to  HOW TO PROCEED WITH DIAGNOSIS CAN Communication Inspection Using CONSULT-II (Self-Diagnosis).

1. CHECK FUSE 
   • Check 15A fuse [No.1, located in fuse block (J/B)]
   • Check 15A fuse [No.22, located in fuse block (J/B)]
   • Check 50A fusible link (letter M  located in the fuse and fusible link box).
     NOTE: Refer to COMPONENT PARTS AND HARNESS CONNECTOR LOCATION  .

   OK or NG

   1. OK: GO TO 2.
   2. NG: If fuse is blown out, be sure to eliminate cause of malfunction before installing new fuse. Refer to SYSTEM WIRING DIAGRAMS (FX35) or SYSTEM WIRING DIAGRAMS (FX45) .
2. CHECK POWER SUPPLY CIRCUIT 
   1. Turn ignition switch ON.
   2. Check voltage between BCM connector M3, M4 terminal 38, 42, 55 and ground.
      Fig 1: Checking Power Supply Circuit

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

      38 (W/L) - Ground: Battery voltage 

      42 (L/R) - Ground: Battery voltage 

      55 (G) - Ground: Battery voltage 

      OK or NG

   1. OK: GO TO 3.
   2. NG: Check BCM power supply circuit for open or short.
3. CHECK GROUND CIRCUIT 
   1. Turn ignition switch OFF.
   2. Disconnect BCM connector.
   3. Check continuity between BCM connector M4 terminal 49, 52 and ground.

      49 (B) - Ground: Continuity should exist. 

      52 (B) - Ground: Continuity should exist. 

      OK or NG

   1. OK: Power supply and ground circuit are OK.
   2. NG: Check BCM ground circuit for open or short.
      Fig 2: Checking Ground Circuit

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