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Pinpoint Test N : The Subwoofer Speaker Is Inoperative

WARNING: This page is about a different car, the 2016 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

  1. N1 CHECK THE AUDIO SIGNAL TO THE SUBWOOFER SPEAKER

    • Ignition OFF.
    • Disconnect: Subwoofer Speaker C466 .
    • Ignition ON.
    • Operate the audio system in radio tuner (AM/FM) mode.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C466-1
      GFD136918Courtesy of FORD MOTOR COMPANY
      		 C466-2
      C466-3
      GFD136918Courtesy of FORD MOTOR COMPANY
      		 C466-4

    Is a fluctuating AC voltage present? 

    Yes  INSTALL a new subwoofer speaker. REFER to Speaker - Subwoofer .
    No  GO to  N2.

  2. N2 CHECK THE AUDIO CIRCUITS TO THE SUBWOOFER SPEAKER FOR A SHORT TO VOLTAGE

    • Ignition OFF.
    • Disconnect: DSP module C4326C .
    • Ignition ON.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C466-1
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground
      C466-2
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground
      C466-3
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground
      C466-4
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit in question.
    No  GO to  N3.

  3. N3 CHECK THE AUDIO CIRCUITS TO THE SUBWOOFER SPEAKER FOR A SHORT TO GROUND

    • Ignition OFF.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C466-1
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 Ground
      C466-2
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 Ground
      C466-3
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 Ground
      C466-4
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the resistances greater than 10, 000 ohms? 

    Yes  GO to  N4.
    No  REPAIR the circuit in question.

  4. N4 CHECK THE AUDIO CIRCUITS TO THE SUBWOOFER SPEAKER FOR AN OPEN

    Are the resistances less than 3 ohms? 

    Yes  GO to  N5.
    No  REPAIR the circuit in question.

  5. N5 CHECK THE AUDIO CIRCUITS TO THE RR DOOR SPEAKER FOR A SHORT TOGETHER

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  N6.
    No  REPAIR the circuits.

  6. N6 CHECK FOR CORRECT DSP MODULE OPERATION

    • Ignition OFF.
    • Disconnect and inspect the DSP module connectors and related in-line connectors.
    • Repair:
      • Corrosion (clean module pins or install new connectors or terminals)
      • Damaged or bent pins (install new terminals or pins)
      • Pushed-out pins (install new pins as necessary)
    • Reconnect the DSP module connectors and related in-line connectors. Make sure they seat and latch correctly.
    • Operate the system and determine if the concern is still present.

    Is the concern still present? 

    Yes  CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW TSB instructions. If no TSBs address this concern, INSTALL a new DSP module. REFER to Audio Digital Signal Processing (DSP) Module .
    No  The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.
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