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Pinpoint Test H: No Sound From All Speakers

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
  1. H1 CHECK THE AUDIO UNIT 
    • Key in OFF position.
    • Disconnect: Audio Unit C229e
    • Key in ON position.
      • Fig 1: Checking Circuit For Voltage
      GF0025924Courtesy of FORD MOTOR CO.
    • Measure the voltage between the audio unit C229e-7, circuit 1786 (BN/PK), harness side and ground.
    • Is any voltage present? 
    1. YES  : Go to  H2.
    2. NO  : SEND the audio unit to an authorized audio system repair facility. TEST the system for normal operation after the repair.
  2. H2 CHECK CIRCUIT 1786 (BN/PK) FOR A SHORT TO VOLTAGE 
    • Disconnect: SJB C2280a
      • Fig 2: Checking Circuit For Voltage
      GF0025924Courtesy of FORD MOTOR CO.
    • Measure the voltage between the audio unit C229e-7, circuit 1786 (BN/PK), harness side and ground.
    • Is any voltage present? 
    1. YES  : REPAIR the circuit. TEST the system for normal operation.
    2. NO  : Go to  H3.
  3. H3 CHECK FOR CORRECT SJB OPERATION 
    • Key in OFF position.
    • Disconnect all the SJB connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the SJB connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES article. TEST the system for normal operation.
    2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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