Alarm and display problems

[Corbett]

OK so a few problems but they may all be related as they all started simultaneously!
Problem one.
Alarm repeatedly going off whether car is locked or unlocked have tryed pressing start button 5 and 10 times as I've read on here and car not beeping 3or4 times and still going off, I have also tried taping cardboard to bonnet as also suggested, soon will just disconnect the alarm!

Problem 2.
On the car display on the dash it is now missing a tyre and not registering whether the doors are open or closed but only on the right hand side! Left and boot all registers fine.

Not sure if the whole tyre/ door thing is related and to my knowledge the car does not have tyre pressure sensors fitted as the valves are all regular rubber ones, but the rest of the wheels show up fine on the display.

BTW it's a Renault megane 2 Estate 1.5 dci dynamique 2007