Communication Signal Circuit Check

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 terminal 5 and malfunctioning door control unit connector terminal 11.
  
  Fig 1: Continuity Specifications Between Driver Door Control Unit (LCU01) Connector Terminal 5 And Malfunctioning Door Control Unit Connector Terminal 11
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 2: Checking Continuity Between Driver Door Control Unit (LCU01) Connector Terminal 5 And Malfunctioning Door Control Unit Connector Terminal 11
  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. Check the signal between malfunctioning door control unit connector terminal 11 and ground with oscilloscope.
  
  Fig 3: Signal Specification Between Malfunctioning Door Control Unit Connector Terminal 11 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 4: Checking The 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 >>
  - All door control unit (passenger, rear LH or RH) connected are NG.--> Replace driver door control unit (LCU01).
  - Any of door control unit (passenger, rear LH or RH) connected are NG.--> Replace malfunctioning door control unit.