Alarm problem on my Nov 1997 C230k sport 4dr auto
 

hi have got above car and the alarm siren will not switch off (i have key override and have switched off manually) when i reset the red llight flash 6-8 times and turn off green lights flash 6-8 times.I am assuming i have a problem with the battery back up in siren or is it just the fobs as i replaced batteries in 1 and reset the fob

many thanks in advance