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Pinpoint Test L : No Sound From All Sync ® Audio Sources (BLUETOOTH, USB, Audio Input Jack)

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 VERIFY THE OPERATION OF THE SYNC ® SYSTEM AUDIO SOURCES

    • Connect: Multi-Media Interface Tester 105-00120.
    • Using the Multi-Media Interface Tester 105-00120, test the audio output for the audio input jack, USB port, and Bluetooth.

    Is there poor quality, distorted, or no sound from all SYNC ® audio sources? 

    Yes  GO to  L2.
    No  If there is a concern with one or more, but not all audio sources, GO to Symptom Chart - SYNC System  to diagnose the observed symptom.If all audio sources operate correctly with Multi-Media Interface Tester 105-00120, the concern is with the customer's device.

  2. L2 CHECK THE AUDIO SIGNALS FROM THE APIM TO THE ACM

    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.

    • Ignition ON.
    • Operate the audio system in SYNC ® mode and play an audio file.
    • Measure by backprobing:
      Positive Lead Measurement / Action Negative Lead
      C240B-12
      GFD136918Courtesy of FORD MOTOR COMPANY
      		 C240B-25
      C240B-13
      GFD136918Courtesy of FORD MOTOR COMPANY
      		 C240B-26

    Is a fluctuating AC voltage present? 

    Yes  GO to  L7.
    No  GO to  L3.

  3. L3 CHECK THE AUDIO CIRCUITS TO THE ACM FOR A SHORT TO VOLTAGE

    • Ignition OFF.
    • Disconnect: ACM C240B .
    • Ignition ON.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3342A-23
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground
      C3342A-24
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground
      C3342A-25
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground
      C3342A-26
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

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

  4. L4 CHECK THE AUDIO CIRCUITS TO THE ACM FOR A SHORT TO GROUND

    • Ignition OFF.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C3342A-23
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 Ground
      C3342A-24
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 Ground
      C3342A-25
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 Ground
      C3342A-26
      GFD134423Courtesy of FORD MOTOR COMPANY
      		 Ground

    Are the resistances greater than 10, 000 ohms? 

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

  5. L5 CHECK THE CIRCUITS TO THE ACM FOR AN OPEN

    Are the resistances less than 3 ohms? 

    Yes  GO to  L6.
    No  REPAIR the circuit in question.

  6. L6 CHECK FOR CORRECT APIM OPERATION

    • Ignition OFF.
    • Disconnect and inspect the APIM connector.
    • 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 APIM connector. Make sure it seats and latches correctly.
    • Wait at least 2 minutes for the APIM to re-initialize.
    • 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, Refer to APIM Hardware Testing .
    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.

  7. L7 CHECK FOR CORRECT ACM OPERATION

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