Check Communication Line

WARNING: This page is about a different car, the 2003 Infiniti M45. However, it is still accessible from the selected car via links, so may be relevant.

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 15.
  
  Fig 1: Checking Communication Circuit Table (1 Of 2)
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 2: Checking Communication Circuit Table (2 Of 2)
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 3: Check Continuity Between Driver Door Control Unit And Malfunctioning Door Control Unit
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG

OK >> GO TO 2.

NG >> Repair or replace harness.
CHECK COMMUNICATION SIGNAL
1. Connect driver door control unit (LCU01) and malfunctioning door control unit connector.
2. Check voltage between malfunctioning door control unit connector terminal 15 and ground.
  
  Fig 4: Malfunctioning Door Control Unit Connector Terminal And Ground Table
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 5: Checking Voltage Between Malfunctioning Door Control Unit Connector And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG

OK >> Communication signal is OK.

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.