Just sharing part and fix info.....
Sitch: 99 E300. Lights flash and interior dome comes on when pushing the panic button on keyfob or when "violating" a door when alarm is set. However there is no squeal from the siren - all quiet.

Possible cause: I've heard these sirens actually have a battery on them that can corrode.

My fix: Part number 219 820 32 26 was installed today and all is working well.

ADDED BONUS: This new siren has a very unobtrusive beep when locking/unlocking now that matches signal light flashes.... i.e. 3 discreet beeps for locking and 1 for unlocking.

Hope this might be helpful for fellow w210 lovers.

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Barker

Thanks for posting!

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#dieselFLEET
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'97 E300
'99 E300

Wait, it's SUPPOSED to beep?!?! It sure is annoying that it doesn't!

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-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250