Phone Module (PHM)

Fig 1: Viewing Phone Module (PHM)

Courtesy of VOLVO CARS CORPORATION

The main task of the phone module (PHM) is to manage voice calls.

The control module is behind the center console.

The phone module (PHM) communicates with components which are directly connected and with other control modules and components via serial communication. The phone module (PHM) uses the MOST network to communicate with other control modules. Diagnostic communication and software downloads are via the Controller area network (CAN).

The phone module (PHM) does not have its own keypad. The keypad and display for the infotainment control module (ICM) are used to manage menus.

The control module checks activations and input and output signals via an integrated diagnostic system. A diagnostic trouble code (DTC) is stored if the control module detects an error. In certain cases the control module replaces the faulty signal with a substitute value.

Any diagnostic trouble codes (DTCs) are stored in the control module memory. This information can be read off using VIDA via the data link connector (DLC) in the car.

If the phone module (PHM) is not powered, there will be no MOST network communication. The Infotainment Control Module (ICM) will then shut down all functionality on the MOST network.