I have recently bought a Renault clio 1.2 1999 and it has a immobiliser on it. Every time i unlock the car via the immobiliser it screams, like a grinding high pitch sound. I am pretty sure its not coming through the speakers, this was my first thought.
Can anyone relate/or maybe diagnose the problem.

Its a toad alarm (not fitted by me), and all the central locking works fine.

Thanks.
Wigins