Audio Communication Line Check (Between Display Control Unit and Audio Unit)

CHECK POWER SUPPLY AND GROUND CIRCUIT
1. Check system of power supply and ground circuit audio unit. Refer to POWER SUPPLY CIRCUIT INSPECTION .
OK or NG
- OK: GO TO 2.
- NG: Check the malfunctioning parts.
CHECK HARNESS
1. Turn ignition switch OFF.
2. Disconnect audio unit connector M45 and display control unit connector M95.
3. Check continuity between audio unit and display control unit.
  
  Fig 1: Connector Terminals Continuity Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check continuity between display control unit and ground.
  
  Fig 2: Checking Continuity Between Audio & Display Control Unit
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 3: Connector Terminals Continuity Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK: GO TO 3.
- NG: Repair harness or connector.
CHECK 1: AUDIO-TX COMMUNICATION SIGNAL
1. Connect display control unit connector.
2. Turn ignition switch ON.
3. Check voltage between display control unit harness connector M95 terminal 40 (R) and ground.
  Approx. 3.5 V or more
OK or NG
- OK: GO TO 4.
- NG: Replace display control unit. Refer to REMOVAL AND INSTALLATION OF DISPLAY CONTROL UNIT .
  
  Fig 4: Checking Voltage Between Display Control Unit Harness Connector Terminal & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK 2: AUDIO-RX COMMUNICATION SIGNAL
1. Connect audio unit connector.
2. Turn ignition switch ON.
3. Check voltage between display control unit harness connector M95 terminal 42 (L) and ground.
  Approx. 3.5 V or more
OK or NG
- OK: GO TO 5.
- NG: Replace audio unit. Refer to REMOVAL AND INSTALLATION OF AUDIO UNIT .
  
  Fig 5: Checking Voltage Between Display Control Unit Harness Connector Terminal & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK 3: AUDIO-TX COMMUNICATION SIGNAL
1. Turn ignition switch ON.
2. Check signal between display control unit harness connector M95 terminal 40 (R) and ground with CONSULT-II or oscilloscope.
  40 (R) - Ground: Refer to TERMINALS AND REFERENCE VALUE FOR DISPLAY CONTROL UNIT .
OK or NG
- OK: GO TO 6.
- NG: Replace audio unit. Refer to REMOVAL AND INSTALLATION OF AUDIO UNIT .
  
  Fig 6: Checking Signal Between Display Control Unit Harness Connector Terminal & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK 4: AUDIO-RX COMMUNICATION SIGNAL
1. Turn ignition switch ON.
2. Check signal between display control unit harness connector M95 terminal 42 (L) and ground with CONSULT-II or oscilloscope.
  42 (L) - Ground: Refer to TERMINALS AND REFERENCE VALUE FOR DISPLAY CONTROL UNIT .
OK or NG
- OK: Replace audio unit. Refer to REMOVAL AND INSTALLATION OF AUDIO UNIT .
- NG: Replace display control unit. Refer to REMOVAL AND INSTALLATION OF DISPLAY CONTROL UNIT .
  
  Fig 7: Checking Signal Between Display Control Unit Harness Connector Terminal & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.