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Sound Is Not Heard From Subwoofer (Premium System)

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  1. CHECK FUSE 

    Check that the following fuse is not blown.

    BLOWN FUSE REFERENCE

    Unit Terminal Signal name Fuse No.
    Audio amp. 17 Battery power 17
    1 Battery power 31

    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 amp. connector.
    2. Check voltage between the audio amp. and ground.
      VOLTAGE SPECIFICATIONS

      Unit Terminal No. OFF ACC ON
      (+) (-)
      Connector Terminal
      Audio amp. M112 17 Ground Battery voltage Battery voltage Battery voltage
      1

    OK or NG 

    OK : GO TO 3.

    NG :

    • Check connector housings for disconnected or loose terminals.
    • Repair harness or connector.
      Fig 1: Identifying Voltage Between Audio Amp. And Ground
      G04757139
  3. GROUND CIRCUIT CHECK 
    1. Turn ignition switch OFF.
    2. Check continuity between audio amp. harness connector M112 terminal 4 and ground, and 20 and ground.

      Continuity should exist. 

    OK or NG 

    OK : GO TO 4.

    NG :

    • Check connector housings for disconnected or loose terminals.
    • Repair harness or connector.
      Fig 2: Identifying Continuity Between Audio Amp. Harness Connector M112 Terminal 4 And Ground, And 20 And Ground
      G04757140
  4. HARNESS CHECK 
    1. Disconnect audio amp. connector M112 and subwoofer connector B72.
    2. Check continuity between audio amp. harness connector terminal and subwoofer harness connector harness connector terminal.
      CONTINUITY CONDITIONS

      Terminals Continuity
      Audio amp. Subwoofer
      Connector Terminal Connector Terminal
      M112 3 B72 3 Yes
      2 1
      18 2
      19 4
    3. Check continuity between BOSE speaker amp. harness connector terminal and ground.
      Fig 3: Identifying Continuity Between Audio Amp. And Subwoofer Harness Connector Harness Connector Terminal
      G04757141
      CONTINUITY CONDITIONS

      Terminals Continuity
      Audio amp. -
      Connector Terminal
      M112 3 Ground No
      2
      18
      19

    OK or NG 

    OK : GO TO 5.

    NG :

    • Check connector housings for disconnected or loose terminals.
    • Repair harness or connector.
  5. SUBWOOFER SIGNAL CHECK 
    1. Connect audio amp. connector and subwoofer connector.
    2. Turn ignition switch to ACC.
    3. Check the signal between audio amp. harness connector terminals with CONSULT-II or oscilloscope.
      SIGNAL REFERENCE

      Terminals Condition Reference signal
      (+) (-)
      Connector Terminal Connector Terminal
      M112 2 M112 18 Receive audio signal
      G04757142
      3 19

    OK or NG 

    OK : Replace subwoofer. Refer to "SUBWOOFER (PREMIUM SYSTEM) ".

    NG : Replace audio amp. Refer to "AUDIO AMP. ".

    Fig 4: Identifying Signal Between Audio Amp. Harness Connector Terminals With CONSULT-II Or Oscilloscope
    G04757143
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