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

Fig 1: BCM Power Supply and Ground Circuit Check 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 connectors.
3. Check voltage between BCM connectors M18 and M20 terminals 38, 70 and ground.
  
  Fig 2: Checking Voltage Between BCM Connectors M18 And M20 Terminals 38, 70
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 3: Identifying BCM Connectors And Terminals
  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.

GROUND CIRCUIT CHART

Connector	Terminals (Wire color)		Continuity
M20	67(B)	Ground	YES

OK or NG

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

Fig 4: Checking Continuity Between BCM Connector M20 Terminal 67 And Ground

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