Engine Control Module (ECM)
WARNING: This page does not describe the selected car, but rather 12 other vehicles, including the 2014 Volvo XC90, 2013 Volvo XC90, 2012 Volvo XC90, 2011 Volvo XC90, and 2010 Volvo XC90. However, it is still accessible from the selected car via links, so may be relevant.
Engine control module (ECM) (4/46) checks the ignition system in the vehicle. The engine control module (ECM) also grants permission to the central electronic module (CEM) if the starter motor is to be allowed to operate when attempting to start. The functions are activated after an approved check of the ignition key has been carried out and an approved identity check has been performed between the engine control module (ECM) and the central electronic module (CEM).
In order for the engine control module (ECM) to work in the immobilizer system, the control module must be programmed with codes. This takes place the first time during installation at the factory, and then if the control module is replaced (when downloading software).