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Pinpoint Test E : No Sound From All Speakers

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. E1 VERIFY THAT THE ACM AND DSP MODULE PASS THE NETWORK TEST

    • Ignition ON.
    • Using a diagnostic scan tool, perform the network test.

    Do the ACM and DSP module pass the network test? 

    Yes  GO to  E2.
    No  REFER to Module Communications Network .

  2. E2 CHECK FOR SPEAKER DTCs

    • Using a diagnostic scan tool, perform the audio DSP module self-test.

    Are any speaker DTCs present? 

    Yes  REFER to the DSP Module DTC Chart .
    No  GO to  E3.

  3. E3 CHECK THE ACM START SENSE CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition OFF.
    • Disconnect: ACM C240A .
    • Ignition ON.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C240A-3
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to  E4.

  4. E4 CHECK THE AUDIBLE PROMPT FUNCTIONALITY

    • Operate the audio system in AM/FM mode.
    • Operate the VOICE steering wheel switch and listen for the SYNC ® audible prompt.

    Does the SYNC ® system produce an audible prompt correctly, indicating voice recognition mode has been entered? 

    Yes  GO to  E5.
    No  GO to  E6.

  5. E5 CHECK FOR AN AUDIO SIGNAL TO THE AUDIO DSP MODULE

    NOTE: This pinpoint test step directs testing circuits using a back-probe method. Use the special back-probe tool POM6411. Do not force test leads or other probes into connectors. Adequate care must be exercised to avoid connector terminal damage, while ensuring that good electrical contact is made with the circuit or terminal. Failure to follow these instructions may cause damage to wiring, terminals, or connectors, and may cause subsequent electrical faults.

    • Operate the audio system in AM/FM mode.
    • Measure by backprobing:
      Positive Lead Measurement / Action Negative Lead
      C2364A-7
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 C2364A-17

    Is fluctuating AC voltage present? 

    Yes  GO to  E11.
    No  GO to  E10.

  6. E6 CHECK THE AUDIO DSP MODULE ENABLE CIRCUIT FOR CORRECT VOLTAGE

    NOTE: This pinpoint test step directs testing circuits using a back-probe method. Use the special back-probe tool POM6411. Do not force test leads or other probes into connectors. Adequate care must be exercised to avoid connector terminal damage, while ensuring that good electrical contact is made with the circuit or terminal. Failure to follow these instructions may cause damage to wiring, terminals, or connectors, and may cause subsequent electrical faults.

    • Operate the audio system in AM/FM mode.
    • Measure by backprobing:
      Positive Lead Measurement / Action Negative Lead
      C2364A-3
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the voltage between 3.5 and 8.5 volts? 

    Yes  GO to  E11.
    No  GO to  E7.

  7. E7 CHECK THE AUDIO DSP MODULE ENABLE CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition OFF.
    • Disconnect: DSP Module C2364A .
    • Disconnect: ACM C240A .
    • Ignition ON.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C2364A-3
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to  E8.

  8. E8 CHECK THE AUDIO DSP MODULE ENABLE CIRCUIT FOR A SHORT TO GROUND

    • Ignition OFF.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C2364A-3
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is the resistance greater than 10, 000 ohms? 

    Yes  GO to  E9.
    No  REPAIR the circuit.

  9. E9 CHECK THE AUDIO DSP MODULE ENABLE CIRCUIT FOR AN OPEN

    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C2364A-3
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 C240A-7

    Is the resistance less than 3 ohms? 

    Yes  GO to  E10.
    No  REPAIR the circuit.

  10. E10 CHECK FOR CORRECT ACM OPERATION

    • Ignition OFF.
    • Disconnect and inspect the ACM 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 ACM 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 ACM. REFER to Audio Control Module (ACM) .
    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.

  11. E11 CHECK FOR CORRECT AUDIO DSP MODULE OPERATION

    • Ignition OFF.
    • Disconnect and inspect all the audio 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 audio 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 audio 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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