Question about 1994 Mercedes-Benz S-Class

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Mercedes S320 central lock

Hi, I've got a 1995 Mercedes S 320, and my central lock work only from the switch inside the car, and when I press the key button nothing happened.
Can you please help me?
Thanks

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  • 5 more comments 
  • Anonymous Dec 28, 2008

    doors will not lock trunk will not lock rear markers will not come up when put into reverse and gas cover will not lock all on same system or what?

  • pattykiddy Dec 31, 2008

    Send previous information to correspondence to PattyKiddy!hotmail.com

  • Anonymous Mar 18, 2014

    My Mercedes e240 2001 model parking lights turn on when i lock the doors with the remote key. Please advice what could be triggering this. Thanks

  • Anonymous Mar 23, 2014

    When central locking button pressed, both green and red light flash but side light does not make noise

  • Anonymous Mar 24, 2014

    my smart key is not going inside the power switch and steering is not being lock

  • Anonymous Mar 28, 2014

    The door buttons go down and straight up, can only lock via trunk or key in passenger door

  • Anonymous Mar 31, 2014

    car is not shifting into 2nd gear,is this "limp mode"?

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My key got very very wet can you help

Posted on Oct 17, 2009

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If you hav a remote control key &yr car wont respond . change key batrrey &contact dealer if still dont work for software

Posted on Jul 13, 2008

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The Key Fob needs to be syncronised to the car........Try this it works for many Mercs1....ensure the battery in the "Key Fob" is OK............Press either Lock or Unlock button for more than 1 second, the lamp on the fob will light if OK. Change battery if it does not illuminate!  2.....if battery on fob OK.......Re Syncronise the key fob to the car by:.... a brief press on either button twice and within 30 seconds turn Key to position 2 on the ignition lock 
Hope that fixes it...let me know?

Posted on Nov 13, 2008

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Posted on Jan 02, 2017

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1 Answer

1995 Mercedes Benz S320


sounds like you have a wiring problem in the main lock switch in the driver side door or wires that run from there to the other doors. one of the wires in this system does not have a good enough connection to allow enough current to operate the locks. put another way, the wire itself is introducing unwanted resistance which reduces the current flow. the resistance could be a result of a poor connection at a junction or a section of wire which has corrosion or some other problem which diminishes flow. to find exactly where the problem lies will involve removing door inner panels and making voltage drop tests across connections. works something like this: i started out with 12v dc, i know this component should use 3.4 v (or whatever it is) but now i only have 4 v coming to this next component. so the wire is using some of the voltage. some drop in the wire is normal, but not very much. that is how i would troubleshoot it. you can just check the connections to power and ground, just look at things and make sure you don't see corrosion, wiggle connections and see if it makes something different happen, but you will still have to take the doors apart to do it. hope that helps

Jun 04, 2009 | 1994 Mercedes-Benz S-Class

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Key problem


You`ve obviously got two problems with ur vehicle,

You need to get a diagnostic readout on the various systems which are being displayed on ur dashboard. If youve been disconnecting the battery, these lights will appear because the steering angle sensor will need setting.

The fact that ur key dont turn could be a few things

Firstly the key, have you got a spare to try? If u havent then get one

Secondly It could be the EIS switch itself, I change loads!

Good luck!!
Carlo@SS

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