Question about 2001 Mercedes-Benz S-Class

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When i turn my key on my wife's 01 mercedes benz s500 there is no ignition light and it will not start.Everything else works just fine.The alarm,the locks and everything work ok.I have changed the car battery and the batteries to the remote and still dont get any response.We are trying to review all possible options before deciding on the dealer.PLEASE HELP.

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If your wife's key works fine and your key doesn't then there is a good possibility that your remote key is faulty. The alarm and locks may still work but those signals go to a different control module the when you try to start the car. If the ignition switch does not read the key then it will not allow you to start the car and sometimes not even turn the key in the ignition. Especially if there is any damage to the front part of the key where the red lens is at. Check and see if the infared signal is working on the remote key. To do this use a camera phone and go like your going to take a picture and point the key right at the lens of the camera phone. If it works you will see it on the screen. If it doesn't then you won't see anything when you push the button and hold it on the remote key. At the dealer they will probably ask for both keys and start by selling you a remote key.

Posted on Oct 11, 2010

  • Transberg Oct 19, 2010

    The camera vs key exercise checked out OK.The beam was very strong.The only key still does not start the car.Before this issue,I had two triangles on the dashboard.Maybe this might narrow the search for a solution

  • Michael Contreras
    Michael Contreras Oct 19, 2010

    From past experiences with this ignition problem in most cases when one key works and the other key doesn't it is usually the key that has gone bad. The only positive way to confirm this is by having the 'sds' hooked up to the car so that actual values can be seen for the das authorization. I'm 95% sure the remote key is bad just from the info you have given and what I have seen in the past.

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