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SL/R230: Alarm / Siren Issues : Goes off for no reason/Kills Battery FIX DIY..
#26
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Join Date: Mar 2018
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2005 R 230 SL350 (M112 3.7). Sold the 1966 W113 230SL recently
To what extend are the batteries exposed to the elements there? And vice versa: one day they will start puking out their gunk again. While inside that puck, the aggressive stuff at least didn’t affect surrounding materials (causing rust?). I think it’s a great idea to recuperate the siren, so just weighing the options.
#28
Same problem!!
I have an 04 e500 and have been going crazy with that stupid siren going off!! Totally random and it would sound like it was dying if that makes sense. Never a steady just siren noise.
Anyway, at 1:00 this morning I had enough and took it out. No difference in the car and I can finally be stress and anxiety free of it and when it’ll start doing it again!!
Totally charred!!
Anyway, at 1:00 this morning I had enough and took it out. No difference in the car and I can finally be stress and anxiety free of it and when it’ll start doing it again!!
Totally charred!!
#29
Im having the exact same issues. First I replaced the service battery with a new one just to rule that out. Then when my new siren arrived i installed it and the problem still occurs. The alarm sounds off while the lights flash. I am at a loss on what to do next or even attempt. Siren code cleared and has not come back on my scanner. what else could it be???
#30
So disconnected it still will not kill the battery? Mine is going off hopefully I can
So the newest issue my car has been having, is that when i lock the doors with the smartkey, about 20 secs later my alarm sounds for no reason, and then the tow away lights begin flashing. At 1st i thought, maybe the rear battery is going, then i thought maybe water was getting into my trunk and shorting the pse pump, and lastly i thought maybe my rear SAM was going bad. Luckily for me, it happens that the siren (mounted beneath the driver's side fender) contains its own 2 batteries, and these go bad. When they go bad, they leak battery acid all over the board, corroding it, and leaving you with these issues : everytime the alarm is activated, the siren will sound soon thereafter. The car thinks its being towed/stolen...
Its easy to fix, just remove left front wheel, the rear part of the inner fender liner, and then reach inside (under the fender) and remove the siren. I decided to remove it with the bracket (3bolts as it seemed the easiest). You can buy a replacement from parts.com for 103.00. I left mine out until i decide if i really want to spend 120.00 shipped on something that is useless. I can always order it, and install it in under 20min if i want to later.
I found many other MB owners have the same problem as i think the siren is the same for the entire mb line of cars (pertinent years).
I have a bunch of pics i thought you guys might wanna see that show the damage.. I sawed the siren in half, just to take a look...
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Its easy to fix, just remove left front wheel, the rear part of the inner fender liner, and then reach inside (under the fender) and remove the siren. I decided to remove it with the bracket (3bolts as it seemed the easiest). You can buy a replacement from parts.com for 103.00. I left mine out until i decide if i really want to spend 120.00 shipped on something that is useless. I can always order it, and install it in under 20min if i want to later.
I found many other MB owners have the same problem as i think the siren is the same for the entire mb line of cars (pertinent years).
I have a bunch of pics i thought you guys might wanna see that show the damage.. I sawed the siren in half, just to take a look...
Attachment 382775
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Attachment 382777
Attachment 382778
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Attachment 382783
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Matt930s (12-21-2023)