Control Module

Fig 1: Identifying Phone Module (PHM)

Courtesy of VOLVO CARS CORPORATION

There are two versions of the phone module (PHM), with or without Volvo On Call functionality (market dependent).

The main task of the phone module (PHM) is to manage the following functions:

voice calls
automatic connection to the Service Center in the event of a collision or alarm (Volvo On Call)
connection to the Service Center for other services when the SOS or ON CALL button is pressed (Volvo On Call).

The control module is above the glove compartment inside the dashboard.

A phone module (PHM) with Volvo On Call functionality cannot be installed as an aftermarket option.

The phone module (PHM) communicates partly with directly connected components and partly with other control modules via the CAN and MOST networks. All diagnostic communication between VIDA (Volvo scan tool) and the phone module (PHM) occurs via the CAN network.

The phone module (PHM) does not have its own keypad. It uses the menus in the keypad on the climate control module (CCM) and the display on the infotainment control module (ICM).

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.

For phone modules (PHM) with Volvo On Call functionality, the driver will also be notified via a message in the driver information module (DIM) if a diagnostic trouble code (DTC) is stored.

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

If the phone module (PHM) is not powered, there will be no MOST network communication and the system is switched off.

The phone module (PHM) has a SIM card reader for the customer's own private phone subscription. For phone modules (PHM) with Volvo On Call function, there is also an internally installed SIM card. This subscription is only connected to the Service Center which handles Volvo On Call services.

For further information, see SIGNALS .

The following applies only to carphones with Volvo On Call

An initiated Volvo On Call service is always assigned higher priority than a standard private call. It will not be possible to make normal calls, and ongoing calls will be interrupted, while the Volvo On Call function is active.

The phone module (PHM) with Volvo On Call function has an integrated reserve battery. The reserve battery must ensure that the control module is supplied with voltage when a Volvo On Call service is activated if normal battery voltage is not available. The residual capacity of the reserve battery is calculated by the control module. When the battery is replaced the level of the capacity must be restored to full value. This is carried out using VIDA (Volvo scan tool). When the calculated capacity has fallen to 30% of full capacity a diagnostic trouble code is stored.

The phone module (PHM) with Volvo On Call function has a reserve microphone and speaker. The loudspeaker is inside the control module. The microphone is by the switches for Volvo On Call. The reserve microphone and speaker are only used when a Volvo On Call service is activated and the standard speaker and microphone for handsfree are not available.

Phone modules (PHM) with Volvo On Call function have an integrated reserve antenna. This is in the control module. The reserve antenna is only used when a Volvo On Call service is activated and if the standard antenna is not functioning. The reserve antenna ensures that the vehicle data can be transmitted and that a voice call can be connected the Volvo On Call Customer Service Center. The reserve antenna cannot be used for the customer's private subscription if the standard antenna is not working.