Accenta / Optima G3 Alarm question?

I moved into a house a few months back, the previous owner stating they never used the alarm from new, so presume the code is factory default.
However I cannot get the alarm system to do anything, ive tried going into programming mode, setting alarm, nothing. The keypad has no reaction. The system tamper LED and Power LED are on. How do I wake this thing up ?
Ive downloaded all the instruction manuals and cannot find an action that the system will respond to.