I seem to remember that someone on here added a fob which allowed them to remotly open the doors and boot without useing the under mirror buttons. I am interested as to where you placed the receiver module in the car.
Just done one to open the boot and put the reciever in the boot taking a permanent live off the interior light. It works from 20 metres so that will do for me.
I was also wondering if there is a feed that is 0V when locked but +12V when unlocked. As I want to open the doors as well as the boot I had thought about putting the receiver in the center consol.