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Power Supply Circuit Inspection

WARNING: This page is about a different car, the 2004 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FUSE 
    • Check that the following fuses of the subwoofer amp. (base system), BOSE speaker amp. (with BOSE) and audio unit are not blown.
    TERMINAL SPECIFICATION

    Unit Terminals Signal name Fuse No.
    Audio unit 6 Battery power 31
    10 Ignition switch ACC or ON 6
    AV switch 1 Battery power 3
    Subwoofer amp. (base system) 9 Ignition switch ACC or ON 4
    BOSE speaker amp. (with BOSE) 1 Battery power 31

    OK or NG

    1. OK: GO TO 2.
    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, subwoofer amp. (base system) or BOSE speaker amp. (with BOSE) connector.
    2. Check voltage between the audio unit and ground.
      TERMINAL SPECIFICATION

      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 0 V Battery voltage Battery voltage
      Fig 1: Checking Power Supply Circuit
      G03496179Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check voltage between subwoofer amp. (base system) and ground.
      TERMINAL SPECIFICATION

      Unit Terminal No. OFF ACC ON
      (+) (-)
      Connector Terminal (wire color)
      Subwoofer amp. B133 9 (W) Ground 0 V Battery voltage Battery voltage
      Fig 2: Checking Voltage Between Subwoofer Amp.
      G03496180Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between BOSE speaker amp. (with BOSE) and ground.
    TERMINAL SPECIFICATION

    Unit Terminal No. OFF ACC ON
    (+) (-)
    Connector Terminal (wire color)
    BOSE speaker amp. B127 1 (Y) Ground Battery voltage Battery voltage Battery voltage
    Fig 3: Checking Voltage Between BOSE Speaker Amp
    G03496181Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK: GO TO 3.
    2. NG:
      • Check connector housings for disconnected or loose terminals.
      • Repair harness or connector.
  3. GROUND CIRCUIT CHECK 

    Check continuity between subwoofer amp. (base system) harness connector B133 terminal 7 (B) or BOSE speaker amp. (with BOSE) harness connector B127 terminal 17 (B) and ground.

    Continuity should exist. 

    Fig 4: Checking Ground Circuit
    G03496182Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK: INSPECTION END.
    2. NG:
      • Check connector housings for disconnected or loose terminals.
      • Repair harness or connector.
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