Key fob batteries are replaced constantly and it doesn’t stop the alarm from going off at all hours of the day and night! Please help! What can I do to make it work properly! Cls550 09.

 

Check f8 (7.5A) at fuse panel behind left panel in trunk if fine proceed by checking most common causes, switch at hood latch (shown on 211 in attachments same for 219) and siren unit - internals corrode. Hood switch is part # 2038219251, siren 1718202526 if need be.