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Pinpoint Test C : 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. C1 CHECK THE START SENSE CIRCUIT FOR A SHORT TO VOLTAGE

    • Ignition OFF.
    • Disconnect: ACM C290A .
    • Ignition ON.
    • Measure:
      Positive Lead Measurement / Action Negative Lead
      C290A-15
      GFD134422Courtesy of FORD MOTOR COMPANY
      		 Ground

    Is any voltage present? 

    Yes  REPAIR the circuit.
    No  GO to  C2.

  2. C2 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.
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