BCM Power Supply and Ground Circuit Check

WARNING: This page is about a different car, the 2004 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FUSE
Check 50A fusible link (letter f located in the fuse and fusible link box).

Check 10A fuse (No. 59, located in the fuse and relay box).

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 malfunction before installing new fuse. Refer to
CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch ON.
2. Check voltage between BCM connector M18, M20 terminal 38, 70 and ground.
  38 (W/L) - Ground: Battery voltage
  
  70 (W/B) - Ground: Battery voltage
  
  Fig 1: Checking Voltage Between BCM Connector Terminal 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
1. Turn ignition switch OFF.
2. Disconnect BCM.
3. Check continuity between BCM connector M20 terminal 67 and ground.
  67 (B) - Ground: Continuity should exist.
OK or NG
1. OK: Power supply and ground circuit is OK.
2. NG: Repair or replace harness.

Fig 2: Checking Continuity Between BCM Connector Terminal And Ground

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