Power Supply And Ground Circuit Inspection

WARNING: This page is about a different car, the 2005 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.

CHECK BCM FUSES
Check if any of the following fuses for the BCM are blown.

Fig 1: BCM Fuse Identification Chart
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 COMPONENT PARTS AND HARNESS CONNECTOR LOCATION .
CHECK BCM POWER SUPPLY CIRCUIT
1. Disconnect BCM connector.
2. Check voltage between BCM connector and ground.
  
  Fig 2: BCM Connectors M19, M20 Terminal Voltage Reference Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 3: Checking Voltage Between BCM Connector Terminals 11, 38, 55 & 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 M19 terminal 52 and ground.
  52 (B/W) - Ground : Continuity should exist.
Fig 4: Checking Continuity Between BCM Connector M19 Terminal 52 & Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
- OK : BCM circuit is OK. Check the driver seat control unit.
  GO TO 4.
- NG : Repair or replace harness.
CHECK FUSES
Check if any of the following fuses for the driver seat control unit and automatic drive positioner control unit are blown.

Fig 5: Drive Seat Control Unit Fuse Reference Chart
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 COMPONENT PARTS AND HARNESS CONNECTOR LOCATION .
CHECK DRIVER SEAT CONTROL UNIT POWER SUPPLY CIRCUIT
1. Disconnect driver seat control unit connector.
2. Check voltage between driver seat control unit connector and ground.
  
  Fig 6: Drive Seat Control Unit Connectors P2, P3 Terminal Voltage Reference Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 7: Checking Voltage Between Driver Seat Control Unit Connector 6, 33, 40 & 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 terminals 32, 48 and ground.
  32 (B) - Ground : Continuity should exist.
  
  48 (B) - Ground : Continuity should exist.
  
  Fig 8: Checking Continuity Between Driver Seat Control Unit Connector P2 Terminals 32, 48 & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK : Driver seat control unit circuit check is OK, GO TO 7.
- NG : Repair or replace harness.
CHECK AUTOMATIC DRIVE POSITIONER CONTROL UNIT POWER SUPPLY CIRCUIT
1. Disconnect automatic drive positioner control unit connector.
2. Check voltage between automatic drive positioner control unit connector M42 terminals 34, 39 and ground.
  
  Fig 9: Automatic Drive Positioner Control Unit Connector M42 Terminal Voltage Reference Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 10: Checking Voltage Between Automatic Drive Positioner Control Unit Connector M42 Terminals 34, 39 & 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 M42 terminals 40, 48 and ground.

40 (B) - Ground : Continuity should exist.

48 (B) - Ground : Continuity should exist.

Fig 11: Checking Continuity Between Automatic Drive Positioner Control Unit Connector M42 Terminals 40, 48 & Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG
- OK : Automatic drive positioner control unit circuit is OK.
- NG : Repair or replace harness.