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Alarm siren replacement - SL500

Discussion in 'General Mercedes-Benz Related Discussion' started by rexemper, Feb 21, 2017.

  1. rexemper

    rexemper Senior Member

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    Hi

    Managed to get the wheel arch liner off to get at the alarm siren and thought I'd share what I found:

    Here's the siren - looking pretty clean and tidy:

    [​IMG]

    [​IMG]

    Used a hacksaw to open it up as nothing else seemed to work. So a few minutes with the saw and not so pretty inside:

    [​IMG]

    [​IMG]

    I taped up the connector and put the case/holder back in the car. New siren ordered so hopefully that will get it all working properly again.

    I had to buy a Torx security bit set and just for reference, it was the T40 bit that I needed to undo the Torx bolt.

    Feel very productive! Let's hope the new one goes in OK and works.

    :cool:
     
  2. John Laidlaw

    John Laidlaw Senior Member

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    Nice feeling when you get something done isn't it? Good job
     
  3. OP
    rexemper

    rexemper Senior Member

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    Finally got round to fitting the new alarm siren this afternoon. Put a little switch/contact cleaner onto the plug before fitting the new one into place. Also have a bag of M8 bolts with 9 spares...

    Works well, I now have 3 chirps when locking the car alongside the lights flashing and one chirp when unlocking, along with the flashing lights.

    Quite pleased with myself (especially as it started raining quite hard in the middle of it all).

    Found out that one of the emergency key elements doesn't actually work - won't lock or unlock anything - though.
     
  4. AMGeed

    AMGeed Senior Member

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    ^ That's two of us repacing alarm sirens this week.
    The chirp is a nice reminder its locked now.
     
  5. OP
    rexemper

    rexemper Senior Member

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    Yes, its a simple thing but a nice confirmation that its locked.
     
  6. Cole@MBS

    Cole@MBS Forum Supporter Authorised Forum Supporter

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    3 of us, I replaced my siren this week on my CLK, there coded now for Belgium from factory but can be coded to other countries which removes the chirp.......
     
  7. AMGeed

    AMGeed Senior Member

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    ^ I like the chirp. Seems a few sirens going down over winter.
     
  8. EmilysDad

    EmilysDad Senior Member

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    I wonder if your neighbours do too :rolleyes:
     
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  9. AMGeed

    AMGeed Senior Member

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    I doubt it bothers them in the slightest. Its very quiet. Just audible next to the car.
     
  10. OP
    rexemper

    rexemper Senior Member

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    Opening the old one up and I think it'd been out for a while!

    The chirp is actually quite subtle - and not very loud. I doubt it can be heard very far away at all.

    An old Saab I had 'chirped' 3 times on lock/unlock and it was the horn that did the chirping - that wasn't very subtle!
     
  11. flowrider99

    flowrider99 Senior Member

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    I like the very quiet chirp the my SL makes when locking and unlocking but i had to disable it on my ML as it beeps the horn!
     
  12. EmilysDad

    EmilysDad Senior Member

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    I'm very aware of opening my R Class's chiming tailgate in the early hours
     
  13. John Laidlaw

    John Laidlaw Senior Member

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    When you get the smart top module fitted it gives you the option to have the chirp activated again....I didn't !
     
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  14. Rick Edwards

    Rick Edwards New Member

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    I've spent a couple hour
     
  15. ajlsl600

    ajlsl600 Senior Member

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    my 01 clk still working my 03 sl 600 died last yr new one in boot ready to fit .interviewed old one batt leaked rotted board another bad design . would be ok if one could open it and change bat .
     
  16. OP
    rexemper

    rexemper Senior Member

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    Hi
    I've replied to your message. I can see that the pics are no longer visible so it may be harder to see what to do. But to answer your question - the siren is behind the wheel arch liner and is behind the wing, not the fog light (so at the back of the front wheel).

    Once you get the liner off its fairly simple to see it, though you do need a bit of dexterity to get the bolts off to remove the siren.

    Good luck.
     
  17. Rick Edwards

    Rick Edwards New Member

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    The 1st place I looked was your pictures which are now various wood stains
     
  18. zenteknika

    zenteknika Member

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    Hi Can I ask which wheel arch is it behind-UK drivers or passenger side?
    - is there a generic part or does it have to be Mercedes part?
    does it need a garage to code it to my car?
    Many thanks
     
  19. ajlsl600

    ajlsl600 Senior Member

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    another daft, for owners scheme .i had to change this as well 105 euro , cause ,looks same as yrs battery leakage screws pcb. if it was replaceable and i could not be bothered i would get it..but sealing it ??
     
  20. AMGeed

    AMGeed Senior Member

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    The alarm is a MB part only and costs £100
    Only one torx bolt to remove and its plug and play. No coding.
    The new alarms also have an audible sound when locking.

    Not sure which side on an SL. Its drivers side on a W211;)
     

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