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Diagnosis Procedure

WARNING: This page is about a different car, the 2009 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
  1. HARNESS CHECK
    1. Disconnect subwoofer amp. connector B21 and suspect subwoofer connector.
    2. Check continuity between subwoofer amp. harness connector B21 (A) and suspect subwoofer harness connector (B).
      CONNECTOR TERMINAL CONTINUITY CHART

      A B Continuity
      Connector Terminal Connector Terminal
      B21 6 B16 1 Yes
      5 2
      10 B17 1
      8 2
      Fig 1: Checking Continuity Between Subwoofer Amp Connector B21 And Suspect Subwoofer Harness Connector
      G05885675Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check continuity between subwoofer harness connector B21 (A) and ground.
    CONNECTOR TERMINAL CONTINUITY CHART

    A - Continuity
    Connector Terminal
    B21 6 Ground No
    5
    10
    8

    Are the continuity test results as specified? 

    YES: GO TO 2.

    NO:

    • Check connector housings for disconnected or loose terminals.
    • Repair harness or connector.
  2. REAR SUBWOOFER SIGNAL CHECK
    1. Connect subwoofer amp. connector B21 and suspect subwoofer connector.
    2. Turn ignition switch to ACC.
    3. Push POWER switch.
    4. Check the signal between subwoofer amp. harness connector B21 terminals with CONSULT-III or oscilloscope.
    CONNECTOR TERMINAL SIGNAL CHART

    Connector Terminals Condition Reference signal
    (+) (-)
    B21 6 5 Receive audio signal
    G05885676Courtesy of NISSAN MOTOR CO., U.S.A.
    10 8
    Fig 2: Checking Signal Between Subwoofer Amp Harness Connector B21 Terminals
    G05885677Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the audio signal voltage as specified? 

    YES: Replace suspect subwoofer. Refer to "REMOVAL AND INSTALLATION ".

    NO: GO TO 3.

  3. HARNESS CHECK
    1. Disconnect audio unit connector M133 and subwoofer speaker amp. connector B21.
    2. Check continuity between audio unit harness connector M133 (A) and subwoofer amp. harness connector B21 (B).
      CONNECTOR TERMINAL CONTINUITY CHART

      A B Continuity
      Connector Terminal Connector Terminal
      M133 4 B21 2 Yes
      5 1
      13 4
      14 3
      Fig 3: Checking Continuity Between Audio Unit Connector M133 And Subwoofer Amp Harness Connector B21
      G05885678Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check continuity between audio unit harness connector M133 (A) terminal and ground.
    CONNECTOR TERMINAL CONTINUITY CHART

    A - Continuity
    Connector Terminal
    M133 4 Ground No
    5
    13
    14

    Are continuity test results as specified? 

    YES: GO TO 4.

    NO:

    • Check connector housings for disconnected or loose terminals.
    • Repair harness or connector.
  4. SUBWOOFER SIGNAL CHECK
    1. Connect audio unit connector M133 and subwoofer amp. connector B21.
    2. Turn ignition switch to ACC.
    3. Push "POWER" switch.
    4. Check the signal between audio unit harness connector M133 terminals with CONSULT-III or oscilloscope.
    CONNECTOR TERMINAL SIGNAL CHART

    Connector Terminals Condition Reference signal
    (+) (-)
    M133 4 5 Receive audio signal
    G05885679Courtesy of NISSAN MOTOR CO., U.S.A.
    13 14
    Fig 4: Checking Signal Between Audio Unit Connector M133 Terminals
    G05885680Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the audio signal voltage as specified? 

    YES: Replace subwoofer Refer to "REMOVAL AND INSTALLATION ".

    NO: Replace audio unit. Refer to "REMOVAL AND INSTALLATION ".

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