Hey guys. When i press and hold the panic button it does nothing. No lights no sound nothing. I tried everything locking the car, unlocking but nothing happens. Whats going on with it?

 

Ok so I determined that the siren is no longer working. I tested it by locking the doors then manually unlocking an individual door. The lights start flashing with no sound. Does anyone know what part needs to be replaced?

 

The siren . I think theres an internal battery that dies with the age of our cars

 

the siren is located in the aft portion of the left front wheel well (you have to remove the inner fender. You can't change the battery, you have to change the whole unit, about $100.00.
I replaced mine, but never got it to work; one hint is that it must be connected while the alarm is off, i.e. car ign. on.
It is also possible that it was "deactivated" by recoding, if the owners didn't like accidental or inadvertent triggering.

 

Hey thanks for the info. Where did you find it for $100. Ebay has really old ones that most likely will die again. I think the best route is a new one?

 

is this it??

http://www.ebay.com/itm/W215-W220-R230-SL500-CL500-MERCEDES-ALARM-HORN-SIREN-SOUNDER-SPEAKER-BUZZER-/221489988955?hash=item3391d5055b&vxp=mtr

Should I get new? What life do these things have?

 

looks like it, but I got mine from MB for about $100.00.

there are very specific part numbers, and I have heard some of the non-MB don't have the right connectors, just wires.

 

Try to price match with your dealer. Use a reputable site like Autohausaz. One key feature that is missing is a sound when the car locks. You can get an aftermarket version of the siren unit that makes a sound when you lock it.

Don't get a used one. The age of the siren unit is very important, because when the battery explodes it corrodes the circuit board, and the siren doesn't work anymore.

 

Replace it soon
The next stage is battery drain, I have been there !!
And get a new unit or you can end up back at square one.