Check Communication Line

CHECK COMMUNICATION CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect connectors for driver door control unit (LCU01) and malfunctioning door control unit.
3. Check continuity between driver door control unit (LCU01) connector and malfunctioning door control unit connector.
  
  Fig 1: Connector Terminals Reference Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 2: Connector Terminals Reference Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 3: Checking Continuity Between Driver Door Control Unit (LCU01) Connector And Malfunctioning Door Control Unit Connector
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 2.
2. NG: Repair or replace harness.
CHECK COMMUNICATION SIGNAL
1. Connect driver door control unit (LCU01) and malfunctioning door control unit connector.
2. Check the signal between malfunctioning door control unit connector and ground with oscilloscope.
  
  Fig 4: Connector Terminals Reference Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 5: Checking Signal Between Malfunctioning Door Control Unit Connector And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: Communication signal is OK.
2. NG:
  - All door control unit (passenger, rear LH and RH) are NG. --> Replace Driver door control unit.
  - Any of door control unit (passenger, rear LH or RH door control unit) are NG. --> Replace malfunctioning door control unit.