I'd like to do the same on my car, this is an Opel/Vauxhall Astra J year 2010
I have an arduino board and can bus shield, i'd like to make a program that intercepts steering wheel commands (audio commands) in order to command a mp3 player.
I'd like to know :
is there a risk to crash my car ECU if i only connect to CAN H and CAN L ?
is there a chance to distinguish steering wheel codes, or maybe it is normalized ?
Thank you very much and sorry for my poor English