I am looking for instructions on how to install the OEM alarm for the 2004+ 3 series Convertible. I have found instructions on how to install the alarm for the sedan, coupe and convertible (pre 2004 without motion sensors) but not the convertible with motion sensors. The kit can be purchased from Circle BMW for $375.
I normally would not care about the alarm but with the motion sensor things inside the car will be safer with the top down. Believe me you can not put the top up every time you park the car and why have a convertible with the top up!
If it is to difficult, I may see how much the dealer is going to rip me off for.