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Registered 1999 SLK230
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163 Posts
Discussion Starter · #1 ·
Okay, this car is new to me and I am just starting to learn about the quirks. I just got home and for no reason the signal lights, tail lights, are randomly flashing (fog lights are not currently installed). Just an assumption, but is this the PSE issue I have been reading up on? Few things, wife had garage open all day and it is raining outside. Won't have time to resolve this tonight, so should I just pull the battery terminal to keep it froming draining my battery? Wife says the car has been flashing since about 3pm and it is not 6:30pm.

Thanks in advance,

JP
 

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Premium Member 2004 SLK200K
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10,777 Posts
Yes the PSE controls the alarm .
Take the battery off ( make sure you have the radio code if it's the original one ) and check it tomorrow .
Do a search for inverting the PSE .
Another failing on these is the battery in the siren itself .
 

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Administrator Founding Member since 2006
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106,116 Posts
I trained Craige. I'm soooo proud :D
 

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Registered 1999 SLK230
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163 Posts
Discussion Starter · #4 ·
Thank you gentlemen! Just disconnected the battery for the evening. Already had plans to go into the trunk tomorrow to tackle the "annoying beeping issue" I've been having with the trunk alignment, so I will tackle both issues! Has anyone tried sealing their PSE from moisture with something like a can of bed liner?
 

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Administrator Founding Member since 2006
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106,116 Posts

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Registered 1999 SLK230
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163 Posts
Discussion Starter · #7 ·
I have the PSE pulled out right now. When I removed the spare tire, I found a black wire that had been cut, anyone know what that was tied to?



Second - you can see my two plugs on the PSE are corroded. I am about to tear it down and check the board, however not sure if you can see the black plug but two prongs are missing. I think I read that someone used a needle/safety pin to replace the missing pins. Is this recommended? Trying to devise a plan to fix those two.

 

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Premium Member 2004 SLK200K
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10,777 Posts
If there are multiple sires in the cable , it could be from a CD player ?

You can actually buy new pins for soldering in , on eBay or an electrical store , but if you can't wait , anything metalic the right size should do ...
 

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Registered 1999 SLK230
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163 Posts
Discussion Starter · #9 ·
I believe the CD player is optical and only has two (colored) cables fed to it. Not sure what that black copper wire goes to, I never found anything that it might have been connected to.

As for the Lights flashing --- pretty sure the PSE was the issue! I found that I was not the first to work on it, as it already had a plastic grocery bag wrapped around it, but it was not wrapped very well. After removal, I tore the unit apart, found there was a good amount of corrosion on top and bottom of the circuit board. I cleaned everything off with a plastic brush and electronic contact cleaner (which didn't really fair well by the way). I got most of it off with a LOT of scrubbing, drilled two holes in the bottom of the PSE housing , then sealed the board with a polycrylic (all I had), and re-assembled, WD-40 on each of the connectors. I bagged the whole thing in a zip lock freezer bag, then three layers of plastic grocery bags + sealed with electrical tape at the top of each bag. Maybe overkill, but I did not want this happening again. Put the PSE back in the original foam and put back in place. No more flashing! Don't think I fixed anything else (still missing two prongs on the black connector), but the problem seems to have gone away.
 

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*Registered
SLK 230 2000 (Registered Oct 2000) R170 Kompressor Facelift Model 170-449-145kw-197hp Silver
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25 Posts
Thank you for your post

I have just experienced the same type of symptoms with my SLK 230 with the external mirror lights flashing and the alarm sounding when the car was locked using the key fob. Your post and pictures were a great help and led me to pin down the possible cause. I noticed that when the car was locked manually there was a longer delay before the alarm was set off and after using the key fob to disarm it the car locked itself again without any help from me. The other clue was that the alarm sounded different than usual with loud and softer distorted blips. After reading more posts on this problem I thought it could be the alarm siren.
Then the fun began as I called my local main Mercedes dealer to price a new alarm siren only to be confronted by a 'gatekeeper' (a bit like trying to make a doctors appointment) who only gave me one option which was to book a diagnostics test at a cost of £66.00:surprise:. I tried to explain that I just needed a price for the siren unit but I felt I was getting nowhere. I then contacted an independent Mercedes specialist (smercs of Portsmouth) who carried out a SDS (Mercedes Star Diagnostic) test at 'no charge' which confirmed that the siren unit was faulty and I was given a quote of £162.00 to supply and fit a new unit. 'Happy Days' and I was pleased to be able to support a good genuine company.:smile:
 

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Premium Member 1998 SLK230
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3,537 Posts
I believe the CD player is optical and only has two (colored) cables fed to it. Not sure what that black copper wire goes to, I never found anything that it might have been connected to.

As for the Lights flashing --- pretty sure the PSE was the issue! I found that I was not the first to work on it, as it already had a plastic grocery bag wrapped around it, but it was not wrapped very well. After removal, I tore the unit apart, found there was a good amount of corrosion on top and bottom of the circuit board. I cleaned everything off with a plastic brush and electronic contact cleaner (which didn't really fair well by the way). I got most of it off with a LOT of scrubbing, drilled two holes in the bottom of the PSE housing , then sealed the board with a polycrylic (all I had), and re-assembled, WD-40 on each of the connectors. I bagged the whole thing in a zip lock freezer bag, then three layers of plastic grocery bags + sealed with electrical tape at the top of each bag. Maybe overkill, but I did not want this happening again. Put the PSE back in the original foam and put back in place. No more flashing! Don't think I fixed anything else (still missing two prongs on the black connector), but the problem seems to have gone away.
You should clean the drains on the car as well rear drain problem - Mercedes-Benz Forum
 

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Premium Member
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307 Posts
Damn! Looks like I have the same thing

The alarm flashes three times as it should but then the indicators start to flash and a little chirping from the siren under the bonnet

Driving home this afternoon, the alarm sounded while I was driving!
 

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Premium Member
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307 Posts
Looked elsewhere in here and took the space saver out all dry, removed the jack and carrier and the foam box with what I guess is the PSE and it is bone factory dry out it all back in together and it stopped the indicators flashing?

You know the fridge door syndrome- where is the boot light switch? I did drive home with the boot open in the dry and tied down with string the other week and the interior lights have been a little fussy since then but no alarm problems till the other day

I was going to say it is fine with the alarm not armed but then I remembered the alarm siren going off while I was driving home this evening

Boot is bone dry and all drains fully functioning
 
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