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!!

teeshi
February 2009