w203 c180 bouncing lock - Some Answers please

Discussion in 'Electronics' started by c180081c, Apr 29, 2014.

  1. c180081c

    c180081c Hardcore MB Enthusiast

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    Hi Guys,

    My passenger door lock is bouncing. I have read all threads on this and some info is very contradictory.

    I now have the correct spring for the internal repair and im happy with this part.

    Removing the lock however is confusing.

    -Am I correct in saying that there is an airbag behind my passenger door card?

    -Do I NEED to remove it to access the lock and remove it for repair

    -Do I NEED to disconnect the battery (this being a w203 early 2002) will this then damage my rear SAM unit as others have said?

    -Is it worth doing the spring repair or getting a new actuator and fitting a whole "new unit"

    Sorry if i am being over the top but I want to get this right first time.
     
  2. martyz

    martyz Hardcore MB Enthusiast

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    -Am I correct in saying that there is an airbag behind my passenger door card? YES

    -Do I NEED to remove it to access the lock and remove it for repair NO

    -Do I NEED to disconnect the battery (this being a w203 early 2002) will this then damage my rear SAM unit as others have said? No need to disconnect

    -Is it worth doing the spring repair or getting a new actuator and fitting a whole "new unit" Replace the spring,as that is the fault
     
  3. OP
    OP
    c180081c

    c180081c Hardcore MB Enthusiast

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    Awesome thankyou very much!! Sorry if I sound stupid but should I disconnect the airbag when I remove the door card? Just nervous about yanking at the lock around the area of the airbag.
     
  4. martyz

    martyz Hardcore MB Enthusiast

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    No,the airbag stays in situ, no need to touch it at all you will be safe.:thumb:
     
  5. OP
    OP
    c180081c

    c180081c Hardcore MB Enthusiast

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    Awesome thanks, I guess most are over paranoid around airbags. Also means I dont have to buy a new rivet gun
     
  6. miro

    miro Hardcore MB Enthusiast

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    How do you take the lock out without removing the airbag rivets ?
     
  7. martyz

    martyz Hardcore MB Enthusiast

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    It will come out,but persevere with angles,slightly harder
    to get back IIRC.
     
  8. OP
    OP
    c180081c

    c180081c Hardcore MB Enthusiast

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    Do you think it is necessary to drill the rivets out on the window runner or will the lock mechanism clear it?
     
  9. Auto-mobile

    Auto-mobile Hardcore MB Enthusiast

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    Airbag out
    Window runner out
    Replace lock
    Don't cycle the ignition and you won't get a srs warning.
     
  10. OP
    OP
    c180081c

    c180081c Hardcore MB Enthusiast

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    Do I disconnect the battery if/when removing the airbag. Just trying to avoid frying the rear Sam with it being early w203
     
  11. grumpyoldgit

    grumpyoldgit Hardcore MB Enthusiast

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    Never had need to do this myself and I'm not sure if this is going to help or make matters worse for you, but here are instructions lifted from a well known workshop manual.
    As I say, I've never had cause to do this so I don't know if all of the instructions are necessary and relevant.
    They advise to make sure the key is removed from the ignition and to also disconnect the battery negative terminal and wait 15 minutes. Others may know better.

    I'll list them in Sections 19 / 21 / 22 as the lock removal section refers you to the others. (No section 20 as that refers to the back doors).


    Section 19

    [​IMG]
    [​IMG]


    Section 21

    [​IMG] [​IMG]
    [​IMG]
    [​IMG]


    Section 22

    [​IMG]
    [​IMG]
    [​IMG] [​IMG]
     
    Last edited: Apr 30, 2014
  12. OP
    OP
    c180081c

    c180081c Hardcore MB Enthusiast

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    Thankyou very much for all the info guys. the job is now done!! Not too bad all in all. I would suggest removing the airbag (you are mainly working at a height where it could go off in your face removing allowed me to put it in a safer area), I removed the fuses for the airbag module before proceeding with this and all went smoothly. Dead easy to drll out all three alu rivets. You 100% need to remove the three rivets from the black window prop so that you can get the lock unit out but also back in and intact. On further inspection I would recommend not bothering with the springs as the internal workings on mine where well worn also. I got a decent low milage lock from Dronsfields mercedes at Royton, I cannot recommen these guys enough.
     
    1 person likes this.
  13. Auto-mobile

    Auto-mobile Hardcore MB Enthusiast

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    Job well done, personally based on the cost of the latch units I'd always replace the unit,me class models are more than double though.
     
  14. OP
    OP
    c180081c

    c180081c Hardcore MB Enthusiast

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    Thanks, I think your right a new unit is the best way to go if its your daily driver. new lock and replace your puddle bulb while your in there.
     

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