Hi,
i have original BMW security alarm that can unlock the door with the remote. It worked pretty poor, i had to be really close to car to unlock it. I changed the battery in the remote but it didn't help at all. Anyway, the unlock system with the remote stopped working. I have to unlock the door with the key. Where to search for a cause?
Second interesting thing is that when i turn on the siren under the hood with the key - the car won't start

Is it some kind of security system? I guess it just cuts off the gas or something...
Here's pic of it:
