SLK230 Alarm fault - Mercedes Benz SLK Forum

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#1 Old 05-20-2019
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SLK230 Alarm fault

I know this topic has been covered so many times - but I canít find the answer to my problem. 1998 SLK230 - Central locking wasnít working but now is. However, I lock the car with the fob - all works as it should. Then after about 3 mins the alarm is activated. I took out the PSE, cleaned the connections, cleaned inside - there was evidence that water had been in - and re-assembled. Everything works as it should - but same 3 mins and the alarm goes off. Any ideas?
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#2 Old 05-20-2019
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#3 Old 05-20-2019
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If your happy with the pse it may be the alarm for the battery.

Have a read of these.
https://www.slkworld.com/gtsearch.php?q=alarm%20battery

If it does need replacing, try MB but I think they no longer stock.

Some have had success by cutting the plastic surround open and just replacing the battery.
One of those threads above may explain.
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#4 Old 05-20-2019
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Hi - thanks for reading. Done a bit more on this tonight having read some of the threads. Changed the car battery for a fully charged new one - no difference. The alarm sounder has been disconnected - before my time - so the hazards come on which I am assuming is alarm activation. First time it is actually after a minute and a half and the hazards flash for a minute, then a 5 second gap and the hazards again flash for a minute or so. Then a 15 second gap and a further minute of flashing. Then a 5 second gap and so it goes on. Interesting was that if I unplug both the white and the black from the PSE while they are flashing the hazards continue to flash. If I leave the black unplugged should that stop activations? Didnít get to try it as I was being eaten by the midges by then. As before, everything else working as it should......ideas? Thanks!
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#5 Old 05-21-2019
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Hi,

Glad I'm not the only one who gets eaten by the little blighters !!

I would get it on SDS and interrogate the ATA with the HHT Win Function, regular Scanners will not access this. If you're ever up near me for a ride I'll do you an SDS Demo on your Car, you'd be surprised what goes on under the surface

I'd say it is a sound bet that the lack of a Siren (dead or not plugged in), could well be the cause of the problem, good used might get you going for a while, but IIRC they are not that expensive from MB, (sub £100) springs to mind.

PSE sees the siren as missing in action, and thinks to itself, "HELP, TAMPER" so it activates the visual warning lamps

When you fit a new one, get it recoded as "Netherlands" then it will chirp upon arm / disarm.

HTH, Cheers Dave
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#6 Old 05-21-2019
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Mmmm ..
The siren in my 320 has also been unplugged by a previous owner but there are no issues at all as regards MIA. CL works perfectly fine as is so I think I'd try another PSE.

Unplug it and just use the key to lock and unlock, see if that makes a difference.
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#7 Old 05-21-2019
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Hi,

I'd say it will make a difference, WIS Wiring shows the blinkers connected to the PSE so my educated guess is the PSE drives them under lock / unlock confirmation, and ATA sends Alarm Signal to PSE upon trigger

I can't say for definite on R170, but on other MB's with the same Siren, I have found when the Alarm is set and Siren dies this visual flashing keeps on until the siren has been changed, faults cleared and then and re version coded if you want chirp, conversely if siren dies when not set, like my W220 did recently when in the workshop unlocked for a few days, that one did not keep flashing the indicators

Be good to find out for sure on R170's

Trouble here is MB do not release much info on their Security which is understandable, but also a Royal PITA sometimes.

BTW FWIW, R170 is electronically similar to V Class W638 with things like DAS 2 and Alarm etc, a lot of HHT Win use on the W638, so I'd imagine if you find a post about a W638 doing this then the fix will likely be similar, although they do not have PSE, ATA is still the same

HTH, Cheers Dave
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#8 Old 05-21-2019
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Quote:
Originally Posted by Mwdavey View Post
Hi - thanks for reading. Done a bit more on this tonight having read some of the threads. Changed the car battery for a fully charged new one - no difference. The alarm sounder has been disconnected - before my time - so the hazards come on which I am assuming is alarm activation. First time it is actually after a minute and a half and the hazards flash for a minute, then a 5 second gap and the hazards again flash for a minute or so. Then a 15 second gap and a further minute of flashing. Then a 5 second gap and so it goes on. Interesting was that if I unplug both the white and the black from the PSE while they are flashing the hazards continue to flash. If I leave the black unplugged should that stop activations? Didnít get to try it as I was being eaten by the midges by then. As before, everything else working as it should......ideas? Thanks!
Sorry you are having problems with your alarm. I am still chasing issues with mine so understand the frustration.

I think a key question is whether you have a factory fitted alarm, MBSS (Mercedes Benz Security System) dealer fitted alarm or even possibly some other after market alarm.

Does you data card show a factory fitted alarm? The siren for these is mounted under the plastic panel the wipers emerge through and it will have a 3 pin plug.

MBSS alarms fitted by dealers generally seem to have the siren mounted on the inner wing in the engine compartment and have a 4 pin plug. I have one of these on my 230. These alarms were made by a company called Scorpion. I gather that although there is still a company called Scorpion making car alarms it is not related to the original producer who sold out some years ago. I also now understand that these alarms are not connected into the on board diagnostics system but do connect to PSE.

Do you definitely have a factory fitted alarm?

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#9 Old 05-21-2019
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Thank you so much for all of your replies. Iím now learning things I didnít know! I canít reply to all in order as it wouldnít make sense. However, the pieces are beginning to add up.

First, before work this morning I went looking for the alarm siren under the windscreen wipers. It wasnít there but I did find a blocked drain on the (uk) passenger side and cleared it (is there a similar on on the drivers side? Couldnít see for the plastic cover). As per borris1954 comment mine is mounted on the nearside wing and is indeed disconnected. Thus, not factory fitted but fitted later. The stickers on the windows refer to a Mercedes Benz alarm system. I guess it was disconnected due to a fault. Is the principle the same with this - Scorpion presumably - in having a battery that could by ďbreaking inĒ be replaced? Or is a new unit easier? (thanks Dave2302).

Tonight I took the PSE out again as I was suspicious of how clean the white plug was. Cleaned the connections again and refitted. Still the same. Then a minor breakthrough - if I lock the car as the OP, within about a minute the hazards flash for 20 seconds or so, stop flashing then start again. This repeats either 4 or 5 times then nothing. The car stays locked and the hazards donít flash. Success to a degree.

Dave2302 - your logic here is good. The siren is missing and the alarm thinks tamper so activates. However, it canít keep this up forever as the battery will run down. Does it know to do this only 4 (or 5) times and give up? If so then maybe a replacement siren is the answer or I might get 4 noisy activations before silence. A used temporary would prove it. Where would I get a working stand in for the dealer fitted version?

M4rCu5 - next I will try unplugging the PSE and see what happens. Is your a factory fitted alarm or dealer fitted - would that make a difference to how it behaves?

I would say, though, that Iím not too bothered about the siren but ideally if the repeat flashing stopped then I would be happy at that.

Dave2302 - a trip to the north west of Scotland is tempting and not very far.....

Thanks again for your help!
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#10 Old 05-21-2019
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blocked drains

ahhhhh search

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#11 Old 05-22-2019
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I am currently running mine with the alarm siren disconnected and it does not cause the symptoms you have. I think the tamper works the other way round. The 4th wire at the siren is a tamper wire (bonnet switch) so that the siren wails if it's unplugged.

Have you got the red and black dongles? They look a bit like small usb sticks and plug into a small socket. On mine this is on the sidewall under the steering wheel near the bonnet release. Apparently black is used to disable the alarm and the red to programme new black keys and diagnostics. See attached PDF I found last night. Sadly I have neither dongle which I think is my issue as it looks like my alarm was disabled due to faulty siren then the dongles have been lost.
Scorpion MBss2 Alarm Information.PDF

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#12 Old 05-22-2019
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Quote:
Originally Posted by Mwdavey View Post
M4rCu5 - next I will try unplugging the PSE and see what happens. Is your a factory fitted alarm or dealer fitted - would that make a difference to how it behaves?
Quite possibly.
I've only just noticed that the difference could well be that yours is a pre-FL and both of mine are post-FL with factory-fitted under-the-windscreen sirens
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#13 Old 05-27-2019
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I have the same problem with my 2000 SLK 230. I installed a new PSE pump and the unit worked for a week then started back. My car's cruise control, central lock and alarm system all have failed leading me to ask, what do the three systems have in common? Besides the PSE pump, I think the wheel speed sensors are apart of all three. My plan is to install a new battery and replace all the wheel speed sensors and pray.

Let me know what you find out.


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#14 Old 05-27-2019
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Hi,

I can tell you for absolute certain that a fault with ABS / ESP will be transmitted over CAN to other modules, and therefore may well cause issues, ATA is one of them.

Also AFAIK, SDS is the only machine that will access certain of the R170 modules by the HHT Win Emulator on it, ATA, VR, ICM and a few others spring to mind.

I have no knowledge of the Scorpion System, but have successfully programmed and sorted various ATA problems on my own and a customers V6 R170.

HTH, Cheers Dave
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#15 Old 05-27-2019
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Please translate that to simple English for me....thanks.

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