Audio Communication Line Check

WARNING: This page is about a different car, the 2005 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.

CHECK HARNESS
1. Turn ignition switch OFF.
2. Disconnect audio unit connector M45 and display unit connector M93.
3. Check continuity between audio unit and display unit.
  
  Fig 1: Connector M93 Terminal (Wire Color) Specification
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 2: Checking Continuity Between Audio Unit Connector And Display Unit Connector & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check continuity between display unit and ground.
  
  Fig 3: Connector Terminal Continuity Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 2.
2. NG: Repair harness.
CHECK AUDIO TX COMMUNICATION SIGNAL
1. Connect display unit connector.
2. Turn ignition switch ON.
3. Check voltage between display unit harness connector M93 terminal 8 (B/R) and ground.
  
  Fig 4: Checking Voltage Between Display Unit Harness Connector M93 Terminal 8 & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Voltage: Approx. 3.5V
OK or NG
1. OK: GO TO 3.
2. NG: Replace display unit. Refer to "REMOVAL AND INSTALLATION OF DISPLAY UNIT ".
CHECK AUDIO RX COMMUNICATION SIGNAL
1. Connect audio unit connector.
2. Turn ignition switch ON.
3. Check voltage between audio unit harness connector M45 terminal 65 (B/R) and ground.
  
  Fig 5: Checking Voltage Between Audio Unit Harness Connector M45 Terminal 65 (B/R) & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Voltage: Approx. 3.5V
OK or NG
1. OK: GO TO 4.
2. NG: Replace audio unit. Refer to "REMOVAL AND INSTALLATION FOR AUDIO UNIT ".
CHECK AUDIO TX COMMUNICATION SIGNAL
1. Turn ignition switch ON.
2. Check the signal between audio unit harness connector M45 terminal 66 (BR) and ground with CONSULT-II or oscilloscope.
  66 (BR) - Ground: Refer to " TERMINALS AND REFERENCE VALUE FOR DISPLAY UNIT ".
  
  Fig 6: Checking Signal Between Audio Unit Harness Connector M45 Terminal 66 & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 5.
2. NG: Replace audio unit. Refer to "REMOVAL AND INSTALLATION FOR AUDIO UNIT ".
CHECK AUDIO RX COMMUNICATION SIGNAL
1. Turn ignition switch ON.
2. Check the signal between display unit harness connector M93 terminal 10 (BR) and ground with CONSULT-II or oscilloscope.
  10 (BR) - Ground: Refer to " TERMINALS AND REFERENCE VALUE FOR DISPLAY UNIT ".
  
  Fig 7: Checking Signal Between Display Unit Harness Connector M93 Terminal 10 & Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: Inspection End.
2. NG: Replace display unit. Refer to "REMOVAL AND INSTALLATION OF DISPLAY UNIT ".