System Overview

System overview

Control module




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 service centers in the event of a collision or alarm (Volvo On Call)
- connecting to service center for other services when pressing SOS- or ON CALL-button (Volvo On Call) or via menu selection in the display on Infotainment Control Module (ICM).
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 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 via the data link connector (DLC) in the vehicle.
If the phone module (PHM) is not powered, there will be no MOST network communication and the system is switched off.
Phone module (PHM) has a SIM-card reader for the customer's private phone subscription. On certain models the SIM-card holder is installed but has no function.
For phone module (PHM) with Volvo On Call-function there is also an internal SIM-card. This subscription is only connected to the service center that provides Volvo On Call-services.
For further information, also see Signal specifications.

The following applies only to car phones 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 backup battery.
The spare 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. This means that the main battery should be disconnected as short time as possible to save the spare battery. The residual capacity of the spare battery is calculated by the control module.
At battery change the level of the capacity must be reset to full value. This is done using VIDA. When the calculated capacity has gone down to 15% of full capacity, a diagnostic trouble code is generated.
Calculated life of the spare battery is 10 years.
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.
The phone module (PHM) with the Volvo On Call function has an integrated reserve antenna. This is located internally in the control module. The reserve antenna is only used when a Volvo On Call service is activated and when the normal antenna does not function.

Signals
The following table summarizes the input signals to and output signals from the phone module (PHM). The signal types are divided into directly connected signals, MOST and CAN communication. The illustration below displays the same information with the Volvo component designations.