Security On Most

Model year 2007 and 2008 

Fig 1: Control Modules On The Most Network

Courtesy of VOLVO CARS CORPORATION

Model year 2009-2010 

Fig 2: Identifying MOST Network Control Modules (Up To Eight)

Courtesy of VOLVO CARS CORPORATION

Model year 2011 

Fig 3: Control Modules On The Most Network

Courtesy of VOLVO CARS CORPORATION

The function Security on MOST prevents unapproved control modules in the infotainment system from being installed in the vehicle. This is to prevent the theft of units.

The function is controlled by the infotainment control module (ICM). The infotainment control module (ICM) checks the serial numbers 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) compares the 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 moved from one vehicle to another.

A diagnostic trouble code (DTC) is stored in the infotainment control module (ICM) if a control module in the stored list gives the incorrect response.