System Overview

System overview

Control module




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

The main function of the phone module (PHM) is to manage functions for:
- voice calls
- automatic connection to service centers in the event of a collision or alarm (Volvo On Call)
- connection to a service center for other services when the SOS or ON CALL button (Volvo On Call) has been pressed.
The control module is located behind the center console.
Phone module (PHM) with Volvo On Call functionality cannot be retrofitted.
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 a separate keypad but uses menu handling of the keypad and display for the infotainment control module (ICM).
The control module checks activations and input and output signals using 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 be alerted by a message in the driver information module (DIM) when 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 supplied with voltage there will be no communication with the MOST network and the system will shut off.
The phone module (PHM) has a SIM card reader for the customer private telephone subscription. For phone modules (PHM) with the Volvo On Call function there is also an internally mounted SIM card. This subscription is only connected to the service center which supplies Volvo On Call services.
For further information, also see Signal specifications.

The following applies to phones with Volvo On Call
A started Volvo On Call service will always have higher priority than a call via the customer's private telephone subscription. A normal phone call will either not be possible or will be interrupted while a Volvo On Call service is active.
The phone module (PHM) with Volvo On Call function has an integrated spare 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. 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. When the battery is replaced the level of the capacity must be restored to full value. This is carried out using VIDA. 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 reserve loudspeaker. The loudspeaker is located internally in the control module and the microphone is located by the switches for Volvo On Call. The reserve microphone and the reserve loudspeaker are only used when a Volvo On Call service is activated and the normal loudspeaker and handsfree microphone 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 table below summarizes the input signals and output signals to and from the phone module (PHM). The signal type is divided into directly connected signals, MOST and CAN communication. The illustration below reproduces the same information and Volvo component designations.