I recently changed the battery of the remote key and off coarse I had to
take it apart :-), so I took some pictures of it. (Naturally)
1) The key itself is a separate part, all steel, no electronics.
2) The black plastic housing contains the "starting code"; a 4x10 mm
magnet-like thingy clipped in one half of the housing.
3) The remote part has got nothing to do with the rest at all, the
only function is to send a signal to open the car (Mux; for 30 seconds).
This all means; opening the car with the right code does *not* mean you
disarm an eventual original alarm, and one can start the car with a
screwdriver and a hammer. It still fails the transponder-code imbedded in
Oh, and the radio code sits in the ECU, so even if it gets stole it will
*never ever* play without the car's computer. You'll need the dealer's
maintenance-station for that.
So, you all know.