Power Supply And Ground Circuit Inspection

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 BCM FUSES AND FUSIBLE LINK

Fig 1: BCM Power Supply And Fuse Check Reference
Courtesy of NISSAN MOTOR CO., U.S.A.

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 malfunction before installing new fuse. Refer to "ELECTRICAL UNITS LOCATION ".
CHECK BCM POWER SUPPLY CIRCUIT
1. Disconnect BCM.
2. Check voltage between BCM connector and ground.
Fig 2: BCM Power Supply Circuit Terminal Voltage Specifications
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 3: Checking Voltage Between BCM Connector And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
- OK: GO TO 3.
- NG: Repair or replace harness.
CHECK BCM GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between BCM connector M20 terminal 67 (B) and ground.
  - 67 (B) - Ground: Continuity should exist.
OK or NG
- OK: BCM circuit is OK. Check the driver seat control unit.
  GO TO 4.
- NG: Repair or replace harness.
Fig 4: Checking Continuity Between BCM Connector M20 Terminal 67 (B) And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK DRIVER SEAT CONTROL UNIT FUSES AND FUSIBLE LINK
Make sure any of the following fuses in the driver seat control unit and automatic drive positioner control unit are not blown.

Fig 5: Driver Seat Control Unit Power Source And Fuse Specifications
Courtesy of NISSAN MOTOR CO., U.S.A.

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

OK or NG
- OK: GO TO 5.
- NG: If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse. Refer to "ELECTRICAL UNITS LOCATION ".
CHECK DRIVER SEAT CONTROL UNIT POWER SUPPLY CIRCUIT
1. Disconnect driver seat control unit.
2. Check voltage between driver seat control unit connector and ground.
  
  Fig 6: Driver Seat Control Unit Power Source And Connector Terminal Specifications
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 7: Checking Voltage Between Driver Seat Control Unit Connector And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK: GO TO 6.
- NG: Repair or replace harness.
CHECK DRIVER SEAT CONTROL UNIT GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between the driver seat control unit connector P2 terminal 32, P3 terminal 48 and ground.
  - 32 (B) - Ground: Continuity should exist.
  - 48 (B) - Ground: Continuity should exist.
OK or NG
- OK: Driver seat control unit circuit check is OK, GO TO 7.
- NG: Repair or replace harness.
Fig 8: Checking Continuity Between Driver Seat Control Unit Connector P2 Terminal 32, P3 Terminal 48 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK AUTOMATIC DRIVE POSITIONER CONTROL UNIT POWER SUPPLY CIRCUIT
1. Disconnect automatic drive positioner control unit.
2. Check voltage between automatic drive positioner control unit connector M34 terminals 34, 39 and ground.
  
  Fig 9: Automatic Drive Positioner Control Unit Power Source And Terminal Voltage Specifications
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 10: Checking Voltage Between Automatic Drive Positioner Control Unit Connector M34 Terminals 34, 39 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK: GO TO 8.
- NG: Repair or replace harness.
CHECK AUTOMATIC DRIVE POSITIONER CONTROL UNIT GROUND CIRCUIT
Check continuity between the automatic drive positioner control unit connector M34 terminals 40, 48 and ground.
- 40 (B/W) - Ground: Continuity should exist.
- 48 (B) - Ground: Continuity should exist.
OK or NG
- OK: Automatic drive positioner control unit circuit is OK.
- NG: Repair or replace harness.
Fig 11: Checking Continuity Between Automatic Drive Positioner Control Unit Connector M34 Terminals 40, 48 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.