Everything electronic on todays cars is part of the CANBUS - the controller area network daiseychain of components, whose activity is digitally controlled via an electronic control module.
Thus, any functionality you want to alter will involve re-flashing an ecu with altered code.
There are forums dedicated to such things, and some very passionate folks that just love to delve into the nitty gritty details of how all that works.
I suggest you search out some of those forums, and prepare yourself for a very, very steep learning curve.
|