Batteries within the alarm siren are dead . . . There are a few options for you . . .

1) Leave it the way it is and don't worry about it.

2) Look here:

https://www.crossfireforum.org/forum...tml#post770860

3) Upgrade to a Mercedes alarm siren part #1718205326. There may be other part numbers that will work but as far as I know this is the ONLY one proven to work. Prices on E-Bay are all over the place for that part. Suggest you wait for a good buy and try to get one that is from the newest model year donor car you can find (or you'll soon have the batteries going dead in your new siren too). Upgrading your siren will provide the added feature of chirping three times when you lock the car and chirping one time when you unlock the car. The alarm siren is located in front of the windshield in the center of the car under that plastic trim piece. A bit of a job to change it out but in my opinion worth the effort.

Please let us know what you decide to do and how you made out . . .