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

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.