Alarm chirping and now central locking not working off the fob

Hi guys

I hope that you can help me.

My 2003 e320 cdi started chirping the alarm then stopped.

I now cant get the central locking to work or to lock and un lock the car with fob.

I have looked all over the forum and cant find anything.

Great site by the way.

Thanks in advance for any input.


Vig