V50 L5-2.4L VIN 39 B5244S7 (2005)
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.
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.
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.