2004 Nissan-Datsun Sentra SE-RFACTORY OEM SERVICE PROCEDURE

Audio Communication Line Check

WARNING: This page is about a different car, the 2003 Nissan Murano. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK HARNESS 
    1. Turn ignition switch OFF.
    2. Disconnect audio unit connector and display unit connector.
    3. Check continuity between audio unit and display unit.
      AUDIO COMMUNICATION LINE HARNESS CHECK CHART

      Terminals Continuity
      Display unit Audio unit
      Connector Terminal (Wire color) Connector Terminal (Wire color)
      M39 8 (R/G) M46 23 (R/G) Yes
      10 (R/Y) 21 (R/Y)
      9 25
    4. Check continuity between display unit and ground.
      DISPLAY UNIT CONTINUITY CHECK CHART

      Terminals Continuity
      Display unit Ground
      Connector Terminal (Wire color)
      M39 8 (R/G) No
      10 (R/Y)
      Fig 1: Checking Continuity Between Audio Unit And Display Unit Connector Terminals
      G03359944Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK : GO TO 2.
    2. NG : Repair harness.
  2. CHECK AUDIO TX COMMUNICATION SIGNAL 
    1. Connect display unit connector.
    2. Turn ignition switch ON.
    3. Check voltage between display unit harness connector M39 terminal 8 (R/G) and ground.

    Approx. 3.5V or more 

    OK or NG

    1. OK : GO TO 3.
    2. NG : Replace display unit.
    Fig 2: Checking Voltage Between Display Unit Harness Connector M39 Terminal 8 And Ground
    G03359945Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK AUDIO RX COMMUNICATION SIGNAL 
    1. Connect audio unit connector.
    2. Turn ignition switch ON.
    3. Check voltage between Audio unit harness connector M46 terminal 21 (R/Y) and ground.
      1. Approx. 3.5V or more 

    OK or NG

    1. OK : GO TO 4.
    2. NG : Replace audio unit.
    Fig 3: Checking Voltage Between Audio Unit Harness Connector M46 Terminal 21 And Ground
    G03359946Courtesy of NISSAN MOTOR CO., U.S.A.
  4. CHECK AUDIO TX COMMUNICATION SIGNAL 
    1. Turn ignition switch ON.
    2. Check the signal between display unit harness connector M39 terminal 8 (R/G) and ground with CONSULT-II or oscilloscope.
    1. 8 (R/G) - Ground : Refer to " TERMINALS AND REFERENCE VALUE FOR DISPLAY UNIT   ". 

    OK or NG

    1. OK : GO TO 5.
    2. NG : Replace audio unit.
    Fig 4: Checking Voltage Between Display Unit Harness Connector M39 Terminal 8 And Ground
    G03359947Courtesy of NISSAN MOTOR CO., U.S.A.
  5. CHECK AUDIO RX COMMUNICATION SIGNAL 
    1. Turn ignition switch ON.
    2. Check the signal between display unit harness connector M39 terminal 10 (R/Y) and ground with CONSULT-II or oscilloscope.
    1. 10 (R/Y) - Ground : Refer to " TERMINALS AND REFERENCE VALUE FOR DISPLAY UNIT   ". 

    OK or NG

    1. OK : Inspection end.
    2. NG : Replace display unit.
    Fig 5: Checking Voltage Between Display Unit Harness Connector M39 Terminal 10 And Ground
    G03359948Courtesy of NISSAN MOTOR CO., U.S.A.
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