alarm keeps going off - Mercedes Benz SLK Forum

SLK R170 General Discussion SLK 200, SLK 230K, SLK 320, SLK32 AMG

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#1 Old 12-26-2012
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alarm keeps going off

hi, I have an 01 slk320 and since it snowed yesterday, my alarm keeps going off.. the lights blink , but no sound.. also my tow light is on all the time.
I saw a thread relating to the battery inside the alarm horn , but i'm not sure if that's what is causing the alarm to go off.. I also had the rear tires replaced last week.. may be a coincidence.. or maybe not..

can someone help me out? thanks!

in the mean time is there a fuse I can pull to keep the alarm from going off ? right now i just have to keep the doors unlocked!

thanks in advance!
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#2 Old 12-26-2012
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from leapyfish,

fuse locations

http://www.slkworld.com/r170/home.htm

go to component locations, then fuses


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#3 Old 12-26-2012
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got it #9! I pulled it .. no more dome light horn or trunk light... but i guess that's better than a dead battery tomorrow... now I got to find the root cause!

thanks for the post!
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#4 Old 12-27-2012
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im a little confused.. everything points to a bad alarm battery, but I read that the main car battery should still make the alarm go off...and sound the horn.. my lights flash but no sound.. does this mean the horn is bad all together ?i've also seen to check my pse pump...? I have a popping sound coming from the trunk.. it's been doing this for a while.
I just could never really locate the location... kinda sounds like fireworks at a distance...

could this be the issue ? the tow light stays on all the time....

also , when I lock the car .. the lights flash 3 times... is this normal? i always assumed it was.. it's been like that since I bought it in June...

thanks in advance!
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#5 Old 12-27-2012
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Classic symptoms of a wet PSE pump. Search the forum for wet PSE pump threads and you'll find tons of info.
In the mean time, pull out the trunk carpeting, spare tire, jack kit, etc. On the right side you'll see a foam box, pull it out (carefully) and you'll find the PSE inside. Dry the trunk floor (I bet it's wet), dry the PSE pump out (I've had good luck just blowing on it with a warm hair dryer for awhile). Then make sure your trunk seal is installed correctly and the drains (in the trunk through and fuel fill areas) are clear and following well.
Then wrap the wires going into the PSE with some paper towel (keeps water from wicking down them onto the pump) and re-install everything. The foam box is a bit of a struggle to get back in place, so be patient.
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#6 Old 12-27-2012
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i plan on trying to do just that , I have the 6 cd changer in the back as well, do I need to remove that first to get to it ? or is it below ? it got dark and 20 degrees on me last night (in TX go figure) so I have not had a chance to look.

also , since my alarm siren does not seem to be working , what is a good place to buy one of those aside from the dealer ?
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http://www.mercedespartscenter.com/p...?siteid=215720


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#8 Old 12-27-2012
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A1718202526 auto siren part 250
replaced by a2198203226
Attached Files
File Type: pdf Document1.pdf (1.17 MB, 61 views)


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#9 Old 12-27-2012
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ahaha.. you again !! well , I looked at the other link you had sent me and they had the part for $132 .. a quick internet search showed that that was a good price , so I bought it ... i see now that this iste has it a little cheaper .. oh well it's already done !!!

my next step will be to tear down the trunk and find the rest of the goodies that could cause the problem ....

I'm no mechanic , but I do have a degree in Electronics, so I should be able to figure out that part ...

hopefully she will get all fixed up and be back 100%


my car is an 01 slk 320 , I bought it back this summer with 39k miles on it ... it spent most of it's life in California , then the rest in south Texas ... so this is the first time it's ever seen snow or cold weather ....

all kind of little problems are surfacing ... it also has small valve cover leaks forming it seems .... that and the "popping" faint "fireworks " sound once in a while ....

almost forgot to mention the lock for the gas door is also missing .. maybe that's what is popping once in a while trying to close (I guess it's vacuum operated too)...

I don't even know how to gt to that either.... !!

what a learning experience !!!
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#10 Old 12-27-2012
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if you need some part numbers, post your vin so we can get the exact part number


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#11 Old 12-28-2012
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No need to remove the CD changer to access the PSE, it's below.
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#12 Old 12-28-2012
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You should probably sign up for the Electronic Parts Catalog (EPC). Mercedes will give you access to the same screens that their Parts people use - put in your VIN# and it will show you most of the parts in your car.

Go to STARTekInfo.com and sign up. They will ask for a credit card # but the service is free for people located in the US. This thread shows you how.

How to get a Datacard from EPCnet!
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#13 Old 12-31-2014
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Our alarm was doing the same thing. Read about the PSE pump and checked it.... It was dry. Pulled the alarm and replaced it, problem solved.
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