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Old 11-06-2002, 10:15 AM   #1 (permalink)
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Date registered: Aug 2002
Vehicle: 2002 C240
Location: California
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Buttons On Key Are Not Working

My key stopped working this week for locking and unlocking the doors and trunk. I've had my C240 since February and have had no problems with the key before this. Is there a battery that may need to be replaced?

Thanks for your help.
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Old 11-06-2002, 03:40 PM   #2 (permalink)
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key...

sometimes you have to figit with the removable metal key that is used for the glove box or trunk. One day my key stopped working too, but after i moved around the metal key, it worked fine. From time to time i have to do this too, to get it working.

elijah
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Old 11-06-2002, 07:18 PM   #3 (permalink)
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Re: Buttons On Key Are Not Working

I had a problem early on with the keys not working for my C320. It was intermittant at first and the dealer could not verify the problem. Then they completely stopped working for remote functions. (I thought it was the battery but it turned out not to be the case.) I had to have the keys replaced twice before they finally worked. Hope yours is more simple and the battery is the solution.
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Old 11-07-2002, 07:27 AM   #4 (permalink)
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Thanks .elijah. and Cmomma


.elijah. - The removable key sounded like it might be the problem since I had recently used it. I tried jiggling it and even removing it completely. I did get the unlock door feature to work consistently but the lock door and unlock trunk function still do not work at all with this key. Darn.

Cmomma - It sounds like I may have to get this key replaced and hopefully only once not multiple times like you. The other one is working fine.

I wonder if carrying it loosely it my purse might have scratched the sensor or something along that line.

I'll call the dealer today. It doesn't sound like too big of a deal but I would hate to be stuck somewhere without the removable part and not be able to get into my car...

Thanks again.
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Old 11-10-2002, 12:40 PM   #5 (permalink)
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The dealer replaced one of the keys when it started to do this. It took a few weeks to ord...

The dealer replaced one of the keys when it started to do this. It took a few weeks to order it but it fixed it. A small slap [;)] on the key would sometimes made it work when it was acting up.
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Old 11-10-2002, 05:08 PM   #6 (permalink)
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Common problem


For soem reason many C classes are having key probelems. Dealer will diagnose and order you a replacement.
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Old 11-11-2002, 08:54 PM   #7 (permalink)
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Could be caused by a lot of keys on the keychain

That happened to some ML owners
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Old 11-23-2002, 03:17 PM   #8 (permalink)
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Glenda, the dealers don't seem to generally be very competent in diagnosing problems lik...


Glenda, the dealers don't seem to generally be very competent in diagnosing problems like this.

One thing that is happening with these keys is a weak contact spring with the battery. This can easily be fixed by YOU and will more likely than not solve your problem.

Open the key to get to the battery (look in your owner's manual for instructions). When you see the battery, you will see a thin, straight contact bar holding it in. If you lift the contact bar, and gently bend it so the middle of the bar contacts the middle of the battery more firmly, you likely will solve your problem.

I was in line at the parts counter one day and a lady came in with a "dead" key. The parts guy took out the battery, put in a new one, still didn't work (the red light didn't light up). He put the old battery back in and pronounced the key dead. Had to order new ones, come back for reprogramming, etc.

I took her key, and in 30 seconds bent the contact a little, put it back together and it worked fine. She went away happy!
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Old 11-24-2002, 12:59 PM   #9 (permalink)
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Happened to me!!!

Quote:
That happened to some ML owners
YEP, sure did to me!!! on both my ML (I believe 4 keys) and C (3 keys)
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Old 11-26-2002, 08:19 AM   #10 (permalink)
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I will try this suggestion today.

Thanks SoCalC240/6. That sounds a lot easier what the dealer wants to do.

I went to the dealer and told them the problem. Of course the key worked fine while I was there. I explained it was an intermittent problem and that I never knew when the key would work and when it would stop working.

I explained that several people on the MBenz forum had to have their keys reordered with this same problem. He said that because the car is still under warranty that they must run diagnostic tests to look at the codes. They can not just order a new key. This means I have to leave my car with them for an entire day to run these tests. That's not a big problem, it just seems like an awful lot of work and time for a faulty key.

I am going to read the manual about taking the key apart this evening. I don't want to actually do it until the key stops working again. That will tell me if this is my problem. It sure sounds plausible.

Someone mentioned the problem could be too many keys on the same ring. I only carry this key and my credit card on my key ring so I don't think that is the problem with my key.

Thanks again to everyone for all the suggestions. I will post again as soon as I have a definitive answer.
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