Recently i'm unable to lock the car as th alrm keeps going off.

When i centrally lock the car from the key throb after about 30seconds there are a set of beebs and the light on the dash flashes. After this happens a couple of times the alarm goes off.

I now have to leave the car unlocked to stop the alarm going off. Even then the alarm still goes off occasionally.

I've made sure there are no windows or doors slightly open.

Can anyone help?

Paul