2004 Vauxhall Astra Coupe bertone

I recently bought a vauxhall astra coupe bertone 1.8 petrol. And iv realised over the last 2 days when I activate my cars alarm is bleeps 5 times rather than the normal 2 times when locking and once when unlocking. I haven't a clue and the guys in my local garage don't either. Hope you can help me.