The alarm going off when you use the key is perfectly correct behavior. It covers for the car being entered forcibly by turning the lock.
The fob probably needs resychronising. Not unusual when the fob battery goes flat or when it's changed. It's in the instruction book if you have it, but the sequence is: Turn the ignition on, open the drivers door and press the lock button on the fob. The doors should lock and immediately unlock. The fob will then be resynchronised and should work normally.
JS
Edited by John S on 01/03/2008 at 16:30
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