Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSMERCURY2009MILAN PREMIER, 3.0 1, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 202 (ENTERTAINMENT SYSTEM - GENERAL INFORMATION)DIAGNOSIS AND TESTINGAUDIO SYSTEMPINPOINT TESTSPINPOINT TEST A: NO COMMUNICATION WITH THE AUDIO CONTROL MODULETESTING

2009 Mercury Milan Premier, 3.0 1, AWD

Pinpoint Test A: No Communication With The Audio Control Module: Testing

2009 Mercury Milan Premier, 3.0 1, AWDSECTION Testing

WARNING: This page is about a different car, the 2005 Mercury Montego, 2005 Ford Freestyle, and 2005 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.

A1 CHECK CIRCUIT 1111 (VT) FOR VOLTAGE
- Disconnect: Audio Control Module C240a.
- Key in ON position.
- Measure the voltage between the audio control module C240a-1, circuit 1111 (VT), harness side and ground.
  
  Fig 1: Measuring Voltage Between Audio Control Module C240A-1 Circuit 1111 (VT)
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
- Yes : GO to A2.
- No : REPAIR the circuit. TEST the system for normal operation.
A2 CHECK CIRCUIT 1204 (BK/OG) FOR AN OPEN
- Key in OFF position.
- Measure the resistance between the audio control module C240a-13, circuit 1204 (BK/OG), harness side and ground.
  
  Fig 2: Measuring Resistance Between Connector And Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
- Yes : REFER to MODULE COMMUNICATIONS NETWORK to continue network communication diagnosis.
- No : REPAIR the circuit. TEST the system for normal operation.

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.