Security On Most

Fig 1: Control Modules On The MOST Network

Courtesy of VOLVO CARS CORPORATION

The Security on MOST function is intended to prevent non-approved control modules from being installed in the car for the infotainment system. This is to prevent the theft of units.

This function is controlled by the infotainment control module (ICM) (16/1). The infotainment control module (ICM) checks the serial number of all the control modules in the MOST network and compares these with a stored list. The infotainment control module (ICM) retrieves data about the serial number of the control modules via the MOST network. The infotainment control module (ICM) then compares this information with the stored serial numbers.

If a control module is not in the stored list, it is disconnected from the MOST network and the functionality of this control module is blocked. This means that control modules in the MOST network cannot be transferred from one car to another.

If a control module which is in the stored list gives an incorrect response, a diagnostic trouble code (DTC) is stored in the infotainment control module (ICM).