Aussies

M<y2003 MGF has developed a completely new function.
It has decided to" beep" every minute or so,.,variablly..
All access features and immobilising system appear working correctly,
Disconnecting the battery does not change this beep, so the system has a backip supply somewhere.
Doors lock and unlock.
Setting the remote to unlock and lock the system appears good, but after about 30 secs, the beep resumes, but the blinking indicator stays off.
Any suggestions for correction?