Yep FAQed a few times, but in short:
5 preses of start button - no feet on pedals. goes like this.
1 - switch off.
2 -take card out [wait to hear stearing lock click in]
3 - press start button 5 times [you have a 7 second window but make sure they are 5 good presses]
4 - open door and get out
5 - Lock car you will hear a few high pitched bleeps from the driver rear boot area, this tells you sensors have been deactivated.
I do not dead lock it, and have had no problem with the alarm operating it in this manor - everytime you get out with the roof down you will have to do this as it all self arms again as soon as you switch on when you get back in, from what I can gather you are not switching the alarm off just the ultra sonics.
have a go, it took me a few goes to get it right but once you have its simple.
