concept 6 system - blue strobe light flashing?

i have the concept 6 system installed by the previous owner, but have never used it. as far as i know, it's disabled.
for some reason, the blue strobe light has been flashing, which has been a real nuisance to the neighbours, but i have no idea how to stop it from doing this! there is nothing in the instruction sheet i've inherited to help me with this.
Any suggestions is welcome!!