Communication Signal Circuit Check

CHECK COMMUNICATION CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect driver door control unit (LCU01) and malfunctioning door control unit connector.
3. Check continuity between driver door control unit (LCU01) connector terminal 5 and malfunctioning door control unit connector terminal 11.
  
  Fig 1: Terminal Continuity Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 2: Checking Communication Circuit
  Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check continuity between driver door control unit (LCU01) connector terminal 5 and ground.
  1. 5 (G/OR) - Ground: Continuity should not exist.
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. Turn ignition switch ON.
3. Check the signal between malfunctioning door control unit connector terminal 11 and ground with oscilloscope.
  
  Fig 3: Terminal Wire Color Specification
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 4: Checking Signal Between Malfunctioning Door Control Unit Connector Terminal 11 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: Communication signal is OK.
2. NG:
  - If all door control unit (passenger, rear LH or RH) connected are NG, replace driver door control unit (LCU01).
  - If any of door control unit (passenger, rear LH or RH) connected are NG, replace malfunctioning door control unit.