GPS Reception
The GPS receiver receives signals from GPS satellites. The global positioning system module (GPS) (16/139) sends the signals onwards via the MOST network to:
- multimedia module (MMM) (16/108)
- phone module (PHM) (16/60)
- infotainment control module (ICM) (16/1.2).
The signal to the multimedia module (MMM) is used to determine the position of the car. The signal to the phone module (PHM) is used by Volvo On Call/Volvo On Call Plus to locate the car in the event of an emergency.
The signals to the infotainment control module (ICM) is a confirmation that the control module is awake.
When starting from cold, the system must be able to determine the position of the car within 120 seconds. For warm starting the position must be available within 40 seconds.
A cold start is when the system has had no power for a long period. A warm start is where the system has been off for a shorter time, when the car has been in a short-stay car park for example. This does not apply to locations without GPS reception, for example when the car is inside a garage.