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Home >> Audi >> 2015 >> A4 Prestige >> Repair and Diagnosis >> External Pages >> Different car >> Section 738 (Information And Entertainment Systems - THX Audio System) >> Diagnosis And Testing >> Information and Entertainment System >> Pinpoint Tests >> Pinpoint Test L : The Instrument Panel Center Speaker Is Inoperative >> Pinpoint Test L : The Instrument Panel Center Speaker Is Inoperative

Pinpoint Test L : The Instrument Panel Center 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. L1 CHECK THE AUDIO SIGNAL TO THE INSTRUMENT PANEL CENTER SPEAKER

    • Ignition OFF.
    • Disconnect: Instrument Panel Center Speaker C2359 .
    • Ignition ON.
    • Operate the audio system in radio tuner (AM/FM) mode.
    • Measure:

      LH Center Speaker 

      Positive Lead Measurement / Action Negative Lead
      C2359-1
      GFD136918Courtesy of FORD MOTOR COMPANY
      		 C2359-4

      Central Center Speaker 

      Positive Lead Measurement / Action Negative Lead
      C2359-2
      GFD136918Courtesy of FORD MOTOR COMPANY
      		 C2359-5

      RH Center Speaker 

      Positive Lead Measurement / Action Negative Lead
      C2359-3
      GFD136918Courtesy of FORD MOTOR COMPANY
      		 C2359-6

    Is a fluctuating AC voltage present? 

    Yes  INSTALL a new instrument panel center speaker. REFER to Speaker - Instrument Panel .
    No  GO to  L2.

  2. L2 CHECK THE AUDIO CIRCUITS TO THE INSTRUMENT PANEL CENTER SPEAKER FOR A SHORT TO VOLTAGE

    • Ignition OFF.
    • Ignition ON.
    • Measure:

      LH Center Speaker 

      Positive Lead Measurement / Action Negative Lead
      C2359-1
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground
      C2359-4
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground

      Central Center Speaker 

      Positive Lead Measurement / Action Negative Lead
      C2359-2
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground
      C2359-5
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground

      RH Center Speaker 

      Positive Lead Measurement / Action Negative Lead
      C2359-3
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground
      C2359-6
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit in question.
    No  GO to  L3.

  3. L3 CHECK THE AUDIO CIRCUITS TO THE INSTRUMENT PANEL CENTER SPEAKER FOR A SHORT TO GROUND

    • Ignition OFF.
    • Measure:

      LH Center Speaker 

      Positive Lead Measurement / Action Negative Lead
      C2359-1
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 Ground
      C2359-4
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 Ground

      Central Center Speaker 

      Positive Lead Measurement / Action Negative Lead
      C2359-2
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 Ground
      C2359-5
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 Ground

      RH Center Speaker 

      Positive Lead Measurement / Action Negative Lead
      C2359-3
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 Ground
      C2359-6
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the resistances greater than 10, 000 ohms? 

    Yes  GO to  L4.
    No  REPAIR the circuit in question.

  4. L4 CHECK THE AUDIO CIRCUITS TO THE INSTRUMENT PANEL CENTER SPEAKER FOR AN OPEN

    • Measure:

      LH Center Speaker 

      Positive Lead Measurement / Action Negative Lead
      C2359-1
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 C2364C-14
      C2359-4
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 C2364C-2

      Central Center Speaker 

      Positive Lead Measurement / Action Negative Lead
      C2359-2
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 C2364B-13
      C2359-5
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 C2364B-6

      RH Center Speaker 

      Positive Lead Measurement / Action Negative Lead
      C2359-3
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 C2364B-14
      C2359-6
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 C2364B-7

    Are the resistances less than 3 ohms? 

    Yes  GO to  L5.
    No  REPAIR the circuit in question.

  5. L5 CHECK THE AUDIO CIRCUITS TO THE INSTRUMENT PANEL CENTER SPEAKER FOR A SHORT TOGETHER

    • Measure:

      LH Center Speaker 

      Positive Lead Measurement / Action Negative Lead
      C2359-1
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 C2359-4

      Central Center Speaker 

      Positive Lead Measurement / Action Negative Lead
      C2359-2
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 C2359-5

      RH Center Speaker 

      Positive Lead Measurement / Action Negative Lead
      C2359-3
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 C2359-6

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  L6.
    No  REPAIR the circuits.

  6. L6 CHECK FOR CORRECT DSP MODULE OPERATION

    • Ignition OFF.
    • Disconnect and inspect the DSP module 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. 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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