Electronic wiring diagram

Discussion in 'Electronics' started by helen55, Jul 9, 2017.

  1. helen55

    helen55 New Member

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    Joined:
    Jul 9, 2017
    Location:
    Nottingham, UK
    Car:
    Slk 200 2008, Range Rover Vogue. Garaged Norton SS, Blackbird, Yamaha R1, CBR 600...the list goes on
    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.
     
  2. Dec

    Dec Hardcore MB Enthusiast

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    Last edited: Jul 9, 2017
    2 people like this.
  3. grober

    grober MB Club Veteran

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    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:thumb:
     
    1 person likes this.
  4. OP
    OP
    helen55

    helen55 New Member

    Messages:
    3
    Joined:
    Jul 9, 2017
    Location:
    Nottingham, UK
    Car:
    Slk 200 2008, Range Rover Vogue. Garaged Norton SS, Blackbird, Yamaha R1, CBR 600...the list goes on
    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
     
  5. grober

    grober MB Club Veteran

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    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.
     
    1 person likes this.
  6. OP
    OP
    helen55

    helen55 New Member

    Messages:
    3
    Joined:
    Jul 9, 2017
    Location:
    Nottingham, UK
    Car:
    Slk 200 2008, Range Rover Vogue. Garaged Norton SS, Blackbird, Yamaha R1, CBR 600...the list goes on
    Yes I agree...just curious as to what it looks like inside
     

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