98 C280 causing me electro-grief!

First seats occasionally work...then sunroof takes a few days off.

BUT NOW! Oh wow!

When I turn on the radio there is an Ultra-Loud Siren coming from all speakers.
Volume, changing mode, and screaming along does not help.

Almost seems like one of those anit-theft devices to run off a bad-guy...soon it will run me off.

So, no tunes for now!

O'Ma'Gosh!
What can I do...the mechanic at the dealership just told me to not turn it on and sing myself!

I hope someone can help,
Elizabeth