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Alarm Answer Please

2K views 14 replies 9 participants last post by  Rush2112 
#1 ·
I know this has been covered plenty of times but save me trawling through various posts:

My 2005 SLK350, about a month ago started doing the weird alarm things. I would drive the car, park it up, set the alarm, and then two hours later the bloody thing would go off. And then it would keep going off.

After reading various posts the main battery came into question. Mine was far from good so I fitted a new Varta one on it. I guessed after a run the battery was charged, when it stopped the voltage dropped setting the alarm off.

Wrong an hour after fitting new battery the alarm was making its lovely noise again.

So I read the alarm siren units internal batteries wear out causing issues. So Ihad planned to remove it.

Not getting round to it yet, I took the car out yesterday. With the roof down I hear a very similar car alarm sound. About 100 metres down the road I can still hear it. Yep it's mine going off whilst driving, very embarrassing.

I have now removed the article...

The questions please:

Now it's off has that disabled the alarm itself? The car still locks and flashes the indicators. My worry us that if that is not the issue and the alarm still keeps going off it will flatten the battery if I don't see the indicators flashing.

The removed siren part, can that be tested with a meter etc. to check to see if it is faulty? I have seen people have prized it apart to check the internal batteries, but can it be done externally. I don't want to spend out and find its not that.

TBH I don't live in a high crime area and would be happy to run without it if it has just disabled the alarm.

Thanks for your help..
 
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#4 ·
Thanks, I have taped up the plug as it can get water effected.

So in your opions has the alarm now been disabled with the siren removed, or is it still a functioning alarm albeit with just flashing indicators and no noise.


I am just curios to see if the siren is an integral part of the alarm system or just one of the items that shows/tells you it has been activated.

And thank you, if it still plays up I will pull the fuse as per your post.
 
#9 ·
Today, My car started doing strange alarming while driving and my lights flashing while parked type things. I do live in an area with potential for crime so I would like my alarm to work correctly. I have a 2006 SLK 350 that I have owned for several years. What do I need to do to fix this issue?
 
#11 ·
Thanks for the heads up! I would only remove it while I figured out the issue. Sorry for the newb requests but I just moved and I can’t find my laptop with the WIS/EPC installed. Where is the siren with the battery located and which fuse disarms the alarm?

I don’t want my new neighbors running me out of town because my car is waking them up...

Thanks for your help!
 
#14 ·
Siren is out, connector taped up, and the car runs fine with no issues or errant alarms. Thank you for the info... I totally get the recommendation to search, and I had searched, but it gave varying results for the location. My U.S. version 2006 SLK350 the alarm siren was in the battery compartment. For future reference my part number is A171 820 25 26 which is replaced by 219-820-32-26, $137 from MBoemparts.com.

Thank you JBanks, Sneaky Pete, Avel Du and others for the links and info!

... and Yes, I'd love to go to the meet 11/2! Thank you for the invite. I'm checking work schedules and will let you know.
 
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#15 ·
My U.S. version 2006 SLK350 the alarm siren was in the battery compartment. For future reference my part number is A171 820 25 26 which is replaced by 219-820-32-26, $137 from MBoemparts.com.
UPDATE: I received my parts and the 219-820-32-26 siren is not an exact replacement for the original. It uses a threaded stud to mount to the bracket instead of the secure torx screw. It looks like it is longer and will require a spacer to avoid interfering with the bracket mounting to the side wall of the battery compartment. I’ll post up a photo and solution when I get in the garage.
 
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