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Pinpoint Test

  1. CHECK THE Left Front (LF) AND Right Front (RF) DOOR SPEAKER OPERATION
    1. Operate the audio system in radio tuner (Amplitude Modulation/Frequency Modulation (AM/FM)) mode.
    2. Monitor the Left Front (LF) and Right Front (RF) door speaker.
      • Is only the Left Front (LF) door speaker inoperative? 
      1. Yes:  GO to 8  on page 6.
      2. No:  GO to 2  on page 2.
  2. CHECK THE AUDIO AMPLIFIER VOLTAGE SUPPLY CIRCUIT
    1. Ignition OFF.
    2. Disconnect: Audio Amplifier C3504A.
    3. Ignition ON.
    4. Measure:
      Fig 1: Checking Audio Amplifier Voltage Supply Circuit
      G07428680Courtesy of FORD MOTOR CO.
      • Is the voltage greater than 11 volts? 
      1. Yes:  GO to 3  on page 2.
      2. No:  VERIFY the Body Control Module (BCM) fuse 5 (20A) is OK. If OK, REPAIR the circuit.
  3. CHECK THE AUDIO AMPLIFIER GROUND CIRCUIT
    1. Measure:
      Fig 2: Checking Audio Amplifier Ground Circuit
      G07428681Courtesy of FORD MOTOR CO.
      • Is the voltage greater than 11 volts? 
      1. Yes:  GO to 4  on page 3.
      2. No:  REPAIR the ground circuit for an open.
  4. CHECK THE AUDIO AMPLIFIER ENABLE CIRCUIT FOR VOLTAGE
    1. Operate the audio system in radio tuner (Amplitude Modulation/Frequency Modulation (AM/FM)) mode.
    2. Measure:
      Fig 3: Checking Audio Amplifier Enable Circuit For Voltage
      G07428682Courtesy of FORD MOTOR CO.
      • Is the voltage greater than 3.8 volts and less than 6.8 volts? 
      1. Yes:  INSTALL a new audio amplifier. REFER to AUDIO AMPLIFIER .
      2. No:  If the voltage is greater than 6.7 volts, GO to 5  on page 4.

        If the voltage is less than 3.8 volts, GO to 6  on page 4.

  5. CHECK THE AUDIO AMPLIFIER ENABLE CIRCUIT FOR SHORT TO VOLTAGE
    1. Ignition OFF.
    2. Disconnect: Audio Control Module (ACM) C240B.
    3. Measure:
      Fig 4: Checking Audio Amplifier Enable Circuit For Short To Voltage
      G07428683Courtesy of FORD MOTOR CO.
      • Is the any voltage present? 
      1. Yes:  REPAIR the circuit.
      2. No:  GO to 16  on page 13.
  6. CHECK THE AUDIO AMPLIFIER ENABLE CIRCUIT FOR A SHORT TO GROUND
    1. Ignition OFF.
    2. Disconnect: Audio Control Module (ACM) C240B.
    3. Measure:
      Fig 5: Checking Audio Amplifier Enable Circuit For Short To Ground
      G07428684Courtesy of FORD MOTOR CO.
      • Is the resistance greater than 10,000 ohms? 
      1. Yes:  GO to 7  on page 5.
      2. No:  REPAIR the circuit.
  7. CHECK THE AUDIO AMPLIFIER ENABLE CIRCUIT FOR AN OPEN
    1. Measure:
      Fig 6: Checking Audio Amplifier Enable Circuit For Open
      G07428685Courtesy of FORD MOTOR CO.
      • Is the resistance less than 3 ohms? 
      1. Yes:  GO to 16  on page 13.
      2. No:  REPAIR the circuit.
  8. CHECK THE AUDIO SIGNAL TO THE Left Front (LF) DOOR SPEAKER
    1. Ignition OFF.
    2. Disconnect: Left Front (LF) Door Speaker.
    3. Operate the audio system in radio tuner (Amplitude Modulation/Frequency Modulation (AM/FM)) mode.
    4. Measure:
      Fig 7: Checking Audio Signal To Left Front (LF) Door Speaker
      G07428686Courtesy of FORD MOTOR CO.
      • Is a fluctuating Alternating Current (AC) voltage present? 
      1. Yes:  INSTALL a new Left Front (LF) door speaker. REFER to SPEAKER - DOOR .
      2. No:  GO to 9  on page 6.
  9. CHECK THE AUDIO CIRCUITS TO THE Left Front (LF) DOOR SPEAKER FOR A SHORT TO VOLTAGE
    1. Ignition OFF.
    2. Disconnect: Audio Amplifier C3504B.
    3. Ignition ON.
    4. Measure:
      Fig 8: Checking Audio Circuits To Left Front (LF) Door Speaker For Short To Voltage
      G07428687Courtesy of FORD MOTOR CO.
      • Is any voltage present? 
      1. Yes:  REPAIR the circuit in question.
      2. No:  GO to 10  on page 7.
  10. CHECK THE AUDIO CIRCUITS TO THE Left Front (LF) DOOR SPEAKER FOR A SHORT TO GROUND
    1. Ignition OFF.
    2. Measure:
      Fig 9: Checking Audio Circuits To Left Front (LF) Door Speaker For Short To Ground
      G07428688Courtesy of FORD MOTOR CO.
      • Are the resistances greater than 10,000 ohms? 
      1. Yes:  GO to 11  on page 8.
      2. No:  REPAIR the circuit in question.
  11. CHECK THE AUDIO CIRCUITS TO THE Left Front (LF) DOOR SPEAKER FOR AN OPEN
    1. Measure:
      Fig 10: Checking Audio Circuits To Left Front (LF) Door Speaker For Open
      G07428689Courtesy of FORD MOTOR CO.
      • Are the resistances less than 3 ohms? 
      1. Yes:  GO to 12  on page 9.
      2. No:  REPAIR the circuit in question.
  12. CHECK THE AUDIO SIGNAL TO THE AUDIO AMPLIFIER
    1. Ignition OFF.
    2. Disconnect: Audio Amplifier C3504A.
    3. Operate the audio system in radio tuner (Amplitude Modulation/Frequency Modulation (AM/FM)) mode.
    4. Measure:
      Fig 11: Checking Audio Signal To Audio Amplifier
      G07428690Courtesy of FORD MOTOR CO.
      • Is a fluctuating Alternating Current (AC) voltage present? 
      1. Yes:  INSTALL a new audio amplifier. REFER to AUDIO AMPLIFIER .
      2. No:  GO to 13  on page 10.
  13. CHECK THE AUDIO CIRCUITS TO THE AUDIO AMPLIFIER FOR A SHORT TO VOLTAGE
    1. Ignition OFF.
    2. Disconnect: Audio Control Module (ACM) C240A.
    3. Ignition ON.
    4. Measure:
      Fig 12: Checking Audio Circuits To Audio Amplifier For Short To Voltage
      G07428691Courtesy of FORD MOTOR CO.
      • Is any voltage present? 
      1. Yes:  REPAIR the circuit in question.
      2. No:  GO to 14  on page 11.
  14. CHECK THE AUDIO CIRCUITS TO THE AUDIO AMPLIFIER FOR A SHORT TO GROUND
    1. Ignition OFF.
    2. Measure:
      Fig 13: Checking Audio Circuits To Audio Amplifier For Short To Ground
      G07428692Courtesy of FORD MOTOR CO.
      • Are the resistances greater than 10,000 ohms? 
      1. Yes:  GO to 15  on page 12.
      2. No:  REPAIR the circuit in question.
  15. CHECK THE AUDIO CIRCUITS TO THE AUDIO AMPLIFIER FOR AN OPEN
    1. Measure:
      Fig 14: Checking Audio Circuits To Audio Amplifier For Open
      G07428693Courtesy of FORD MOTOR CO.
      • Are the resistances less than 3 ohms? 
      1. Yes:  GO to 16  on page 13.
      2. No:  REPAIR the circuit in question.
  16. CHECK FOR CORRECT Audio Control Module (ACM) OPERATION
    1. Disconnect and inspect all Audio Control Module (ACM) connectors.
    2. Repair:
      • corrosion (install new connector or terminals - clean module pins)
      • damaged pins - install new terminals/pins
      • pushed-out pins - install new pins as necessary
    3. Reconnect the Audio Control Module (ACM) connectors. Make sure they seat and latch correctly.
    4. Operate the system and determine if the concern is still present.
      • Is the concern still present? 
      1. Yes:  CHECK On-Line Automotive Service Information System (OASIS) for any applicable Technical Service Bulletins (TSBs). If a Technical Service Bulletin (TSB) exists for this concern, DISCONTINUE this test and FOLLOW Technical Service Bulletin (TSB) instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new Audio Control Module (ACM). REFER to AUDIO CONTROL MODULE (ACM) .
      2. 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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