@johnkuti we are not even sure how this was bypassed. The Central Electronic Module (CEM) is the main electrical module that communicates with the rest of the car's modules i.e. ECU, BCM, ABS and many others. There are just to many things that could be happening. Check the [document|32558] wiring diagram to see what all connects to it. If your Volvo runs the way it is now and if there are absolutely no issues with it, leave it alone. you may just end up going down a rabbit hole that could get pretty costly.