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Power Supply Circuit Inspection

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

    Check that the following fuses are not blown.

    TERMINAL AND FUSE REFERENCE

    Unit Terminals Signal name Fuse No.
    Audio unit 6 Battery power 31
    10 Ignition switch ACC or ON 4
    AV switch (except Base) 1 Battery power 31
    2 Ignition switch ACC or ON 4
    Audio amp. (with Premium) 1 Battery power 31
    17 Battery power 17

    OK or NG 

    • OK: GO TO 2.
    • NG: If fuse is blown, be sure to eliminate cause of problem before installing new fuse. Refer to "POWER SUPPLY ROUTING CIRCUIT ".
  2. POWER SUPPLY CIRCUIT CHECK 
    1. Disconnect audio unit connector M43 or audio amp. connector M112 (with Premium).
    2. Check voltage between the audio unit and ground.
      Fig 1: Checking Voltage Between Audio Unit And Ground
      G03605977Courtesy of NISSAN MOTOR CO., U.S.A.
      VOLTAGE BETWEEN AUDIO UNIT AND GROUND

      Unit Terminal No. OFF ACC ON
      (+) (-)
      Connector Terminal (wire color)
      Audio unit M43 6 (Y) Ground Battery voltage Battery voltage Battery voltage
      10 (V) Ground 0V Battery voltage Battery voltage
    3. Check voltage between audio amp. (with Premium) and ground.
      Fig 2: Checking Voltage Between Audio Amp. (With Premium) And Ground
      G03605978Courtesy of NISSAN MOTOR CO., U.S.A.
      VOLTAGE BETWEEN AUDIO AMP. (WITH PREMIUM) AND GROUND

      Unit Terminal No. OFF ACC ON
      (+) (-)
      Connector Terminal (wire color)
      Audio amp. M112 1 (Y) Ground Battery voltage Battery voltage Battery voltage

    OK or NG 

    • OK: GO TO 3.
    • NG :
      • Check connector housings for disconnected or loose terminals.
      • Repair harness or connector.
  3. GROUND CIRCUIT CHECK 
    1. Turn ignition switch OFF.
    2. Check continuity between audio amp. (with Premium) harness connector M112 terminal 4 (B), 20 (B) and ground.

      Continuity should exist  .

      3. Fig 3: Checking Continuity Between Audio Amp. Harness Connector M112 Terminal 4, 20 And Ground
      G03605979Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    • OK: Inspection End.
    • NG :
      • Check connector housings for disconnected or loose terminals.
      • Repair harness or connector.
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