Dorset Mark

As of last week I am now a proud owner of a Scooby WRX.
Unfortunatley I inherited a Clifford Blackjax 4 with my new dream machine.
I was woken last night to the chirping of no not Dorset lesser spotted Blackbirds but the Blackjax4 siren. I was and still am not very popular with the neighbours.
The only way for me to stop the chirping and wailing is to disconnect the battery.
Even when I input the code several times (which has worked no problem all week) it still intermitantly chirps and wails at me.
The lights do not flash just the chirps and wails.

Can anybody help?

Yours in desperation.

Dorset Mark