c240 keyless entry problem
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From: PHILIPPINES
07' ML350
c240 keyless entry problem
hi!
my (w203) C240s keyless entry only works when i directly point my key (very near) onto the infrared window on the driver's door handle, otherwise, it is impossible to lock/unlock the car from any point. the batteries on my keys are okay. the keys also start the engine fine. it seems only the infrared system works and not the radio frequency for the keyless entry. thanks.
my (w203) C240s keyless entry only works when i directly point my key (very near) onto the infrared window on the driver's door handle, otherwise, it is impossible to lock/unlock the car from any point. the batteries on my keys are okay. the keys also start the engine fine. it seems only the infrared system works and not the radio frequency for the keyless entry. thanks.
Senior Member
Joined: Nov 2001
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From: Toronto, Ontario Canada
2002 C240 Classic - Orion Blue Beast!!
Re: c240 keyless entry problem
Originally posted by BruNo
hi!
my (w203) C240s keyless entry only works when i directly point my key (very near) onto the infrared window on the driver's door handle, otherwise, it is impossible to lock/unlock the car from any point. the batteries on my keys are okay. the keys also start the engine fine. it seems only the infrared system works and not the radio frequency for the keyless entry. thanks.
hi!
my (w203) C240s keyless entry only works when i directly point my key (very near) onto the infrared window on the driver's door handle, otherwise, it is impossible to lock/unlock the car from any point. the batteries on my keys are okay. the keys also start the engine fine. it seems only the infrared system works and not the radio frequency for the keyless entry. thanks.
If you can't find a resolution to the problem, go to your dealer. They can order new keys for you.
MBWorld Fanatic!
Joined: Nov 2001
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From: Gaithersburg, MD
2002 C240 6-spd (ret)
I agree with David. It's very easy to replace the batteries, so you might want to try that. The key on my 2002 C240 was having problems -- I replaced the batteries and have not had a problem since. Also, is the red LED lighting when you press the lock/unlock buttons on the key? Mine was working intermittently.
Also, had the key been working correctly before? If so, and now it has a problem, I think that would also point to a battery problem.
Also, had the key been working correctly before? If so, and now it has a problem, I think that would also point to a battery problem.
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See Garage
Your car was delivered with two Smart Keys... I'd try the second Smart Key first to see if you still have the problems. If the second key works, then swap batteries from second to first to see if that fixed key #1. If so, then maybe it's a battery problem. If not then maybe Key#1 is bad. Put batteries back in each unit where they started and use key #2 until you can take both back to dealer for free key upgrade.
I had a single day about 3-weeks ago where my Smart Key would lock but not unlock. The check LED worked sporadically. I took the batteries out and put them back in, then everything has worked fine since. The metal clips that hold the batteries in place are not really aggressive in making good contact with the batteries.
I had a single day about 3-weeks ago where my Smart Key would lock but not unlock. The check LED worked sporadically. I took the batteries out and put them back in, then everything has worked fine since. The metal clips that hold the batteries in place are not really aggressive in making good contact with the batteries.
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From: PHILIPPINES
07' ML350
thanks for replying guys!
Well both keys do not work. Both of their check LEDs blink when i press the buttons. I can only lock/unlock using the IR on the drivers door handle. My car is year 2000 production, its brandnew, but i did not have d chance to check it coz i just had it shipped to me, i live in a far place. Could it really be the keys??? or do i have to replace some component/module in the car???
btw, when the car arrived to me, the keyless entry has been like this!!! aarrgghh..
Well both keys do not work. Both of their check LEDs blink when i press the buttons. I can only lock/unlock using the IR on the drivers door handle. My car is year 2000 production, its brandnew, but i did not have d chance to check it coz i just had it shipped to me, i live in a far place. Could it really be the keys??? or do i have to replace some component/module in the car???
btw, when the car arrived to me, the keyless entry has been like this!!! aarrgghh..
Senior Member
Joined: Dec 2001
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Ford Pinto
We had to get two new smart keys for our 2002 C240. They would not work half the time. It was supposedly causing the sun roof not to work, the trunk not to open and the windows not to roll down automaticaly using the one push feature (all of those things were happening using the buttons in the car).
Very weird!!
Replaced the keys, and everything is working again.
So far, I consider this MB car to be more trouble than my 99 Camaro Z28.
I hope our luck gets better. 
Eric
Very weird!!
Replaced the keys, and everything is working again.
So far, I consider this MB car to be more trouble than my 99 Camaro Z28.
I hope our luck gets better. Eric
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'01 C240/6
the keys for these cars are all screwed up.
my key acted like yours, then eventually died. even when it worked, it would only do some of the functions (like it would not roll up the windows all the time).
went to the spare key, it eventually died, too.
there was some kind of recall. the dealer replaced both keys for free and they work great now.
my key acted like yours, then eventually died. even when it worked, it would only do some of the functions (like it would not roll up the windows all the time).
went to the spare key, it eventually died, too.
there was some kind of recall. the dealer replaced both keys for free and they work great now.
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Member
Joined: Nov 2001
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From: Midwest
2002 C240
Ever try to put the key under you chin, and depressing one of the buttons? Apparently you head will act as an antenae and the range is greatly improved. I tried in once in a parking lot and it actually works!
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'01 C240/6
Originally posted by freakinfreak
Are your windows tinted? That was the root of my problem. After I had my tint removed, I have no problems w/ the keyless entry range.
Are your windows tinted? That was the root of my problem. After I had my tint removed, I have no problems w/ the keyless entry range.
MBWorld Fanatic!
Joined: Nov 2001
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From: Earth
GLB 250 4matic
Originally posted by c240x
Ever try to put the key under you chin, and depressing one of the buttons? Apparently you head will act as an antenae and the range is greatly improved. I tried in once in a parking lot and it actually works!
Ever try to put the key under you chin, and depressing one of the buttons? Apparently you head will act as an antenae and the range is greatly improved. I tried in once in a parking lot and it actually works!
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Joined: Nov 2001
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From: Studio City, CA
2009 BMW 750i, 2008 Toyota Prius
Originally posted by SoCal240/6
isn't the sensor (at least on the sedans, don't know about the coupe) that little square thing on the front door handles?!? If so, how would tinted windows affect it?
isn't the sensor (at least on the sedans, don't know about the coupe) that little square thing on the front door handles?!? If so, how would tinted windows affect it?
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From: Houston,TX-moving to The Woodlands,TX SOON!!!
Toyota Tacoma & Lexus IS250
just keep it unlocked to let the beautiful filipina girls into your car!!
seriously, take it to the dealer(if there is one there) or call Mercedes.
seriously, take it to the dealer(if there is one there) or call Mercedes.
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From: Sri Lanka
I had a similar problem where my spare key stopped working. I took it to the dealer and they replaced both keys for me. Now they seem to be working fine and I do have a tint. I didn't have the tint when I first had the key issue.
I would definitely take it to the dealer and see what they have to say .... because my key works from a good distance away.. atleast for the locking and unlocking. to open the trunk etc, i have to be pretty close.
good luck
I would definitely take it to the dealer and see what they have to say .... because my key works from a good distance away.. atleast for the locking and unlocking. to open the trunk etc, i have to be pretty close.
good luck
Newbie
Joined: Oct 2010
Posts: 3
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2004 CLK 320
I have having problems with the keyless go system in my wife's CLK320. Neither key works except when inserted in the keyslot to start the car. Both sets of batteries have been replaced with no change. I've checked the fuse on a DVM and it checks good. Any advice would be greatly appreciated! I'll try disconnecting the main battery but don't hold out much hope.
Thanks
Thanks
Member
Joined: Mar 2012
Posts: 229
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From: Miami, FL
2002 Miata
hi!
my (w203) C240s keyless entry only works when i directly point my key (very near) onto the infrared window on the driver's door handle, otherwise, it is impossible to lock/unlock the car from any point. the batteries on my keys are okay. the keys also start the engine fine. it seems only the infrared system works and not the radio frequency for the keyless entry. thanks.
my (w203) C240s keyless entry only works when i directly point my key (very near) onto the infrared window on the driver's door handle, otherwise, it is impossible to lock/unlock the car from any point. the batteries on my keys are okay. the keys also start the engine fine. it seems only the infrared system works and not the radio frequency for the keyless entry. thanks.
Junior Member
Joined: Sep 2010
Posts: 64
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From: San Francisco, CA
'03 C240 and '05 C230
I'm having the same problem in my 2003 C240. I just had my car retinted yesterday with the same percentage tint and now the key does not work unless I am right next to the driver's door pointing the key at the infrared sensor. I replaced both batteries thinking that was the problem. Does anyone have any advice?
MBWorld Fanatic!
Joined: Jan 2005
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From: Orange County
2005 C Wagon (No snickering please!)
CMH, your tint installer has broken the connection between the antenna amplifier and the rear window grid. They might have broken a trace on the window when removing the old tint. This happens frequently.
Newbie
Joined: Apr 2014
Posts: 2
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From: Wilmington,N.C.
2004 C240
Keyless entry
Does anyone have a picture of the window grid and the antena amp wire to tell if its broken. I just got my 04 C240 tinted yesterday and now I have no keyless entry. I changed the batteries in the remote and nothing. I have to use the actual key to get in. Could it be a fuse thats blow? Any help on this would be great appreciated.
Newbie
Joined: Nov 2015
Posts: 4
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2004 Mercedes Benz C240
Does anyone have a picture of the window grid and the antena amp wire to tell if its broken. I just got my 04 C240 tinted yesterday and now I have no keyless entry. I changed the batteries in the remote and nothing. I have to use the actual key to get in. Could it be a fuse thats blow? Any help on this would be great appreciated.
