Electronic wiring diagram

[helen55]

Hi everyone
I have a problem with my slk200 r171 2008. I've had the car 5 years and have had no problems - I love it! But this week the alarm system starting playing up. When locked the lights flashed as it would for the tow alarm then the siren would go off. When using the key fob to unlock the lights flashed correctly. But seconds later the siren would go off intermittently. I have read the MB forums and followed links regarding the PSE pump but we can't find it. My husband has taken all the relevant panels out of the boot where it could have been situated but no it's not there.

We have had to take out the siren as it will not behave!

Our question is does my model actually have a PSE pump or is it electronic? We are baffled.

Thanks to anyone who can shine any light on this for me.

 

[Dec]

You need a new alarm siren from an MB dealer, costs about £100 if you fit it yourself, very common problem.

See… https://www.google.com/search?q=w21...8&bih=922#tbm=isch&q=slk+alarm+siren+location

Dec

 

[grober]

The earlier SLK R170 had a PSE [ VACUUM ]PUMP because the doors were vacuum operated . Your later SLK R171 has electrically operated doors so no need for a PSE pump. Many of these problems can have their origins in damp /condensation particularly in open topped cars. All these alarms [ under the wing??] have built in batteries as back up to allow them to sound if the main battery was disconnected. These have a finite life and if they go wrong weird alarm things happen. Sometimes merely replacing the alarm unit for a new one is enough to affect a cure.
edit :- DEC GOT THERE BEFORE ME

 

[helen55]

Hi Dec, thanks for this information...I've read your previous links, I think you're right, going to have a look inside the alarm.

Haha...Thanks Grober...you've answered a baffling question...it makes sense it would be electrically operated.

Thanks guys

 

[grober]

Unlikely the alarm is repairable chemical corrosion from the degraded battery usually damages the other PCB [ printed circuit board] + components making it a write off. Best thing is replacement.

 

[helen55]

Yes I agree...just curious as to what it looks like inside