Hi to all,
I have been trying to understand how my E39 knows which button is pressed on the steering wheel?
There are 8 buttons in total on my wheel yet only 4 wires coming from the wheel to the harness. Does the system recognise which button is pressed by a differing resistance or some kind of digital method, multiplexing?
What I am trying to find out is if it is possible to change the function of a certain switch, in particular the recirculating air button which I would really like to be the button that turned ON the cruise control instead of the awkwardly positioned one on the trim that is hard to find and distracting to be hunting for at 70mph!
The switch itself seems to have only been used on early E39s (mine is 1997) and replaced by a switch on the wheel in newer models.
If it is something in the wheel switches themselves would changing the wheel to mabe an M wheel be possible and solve the problem.
If I can't find a solution to this problem I intend to put a foot switch b the foot rest somewhere, just to make it easier and safer to switch the cruise on.
Any ideas or info will be appreciated.