Keyfob remote problems - Mercedes-Benz Forum

 
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post #1 of 6 (permalink) Old 06-25-2009, 10:37 AM Thread Starter
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Keyfob remote problems

Car: 2004 S320D
My keyfob remote control has recently lost operational range. I used to be able to press it 5 metres from the car and the doors opened closed or the boot opened as required. It appears now that the operating range is now within 2 feet of the door handle. I initially thought that new batteries would be required so tried my spare key which also had the same problem. I thought it unlikely that both keyfob batteries would have lost power at exactly the same time but just in case i ordered and fitted a new pair. I've still got the same problem. Could anybody advise what the problem could be here? has anybody else had similar experience with their remote keyfob.
Thanks for any help
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post #2 of 6 (permalink) Old 06-25-2009, 11:55 AM
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Mine have done the same thing and I think with age this happens. Both original keys have about the same range. However, when I bought one the new style chrome key it had a better range than the old ones. I haven't done this but you might try cleaning the IR transmitter window on the key fob and the receiver windows in the door handles to see if that helps.

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post #3 of 6 (permalink) Old 06-25-2009, 12:38 PM
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You mention it works 2 feet from the door handle, do you mean it works with IR only? Does it open doors if you stand next to the door handle but look away from the car and point the key away from the door? It should, if the RF connection is working. It could be an antenna issue at the car.
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post #4 of 6 (permalink) Old 06-27-2009, 11:57 PM
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What Diesel Benz said sounds correct. Really close to the door handle sounds like the IR signal is working. But the far away problem is a RF issue. A dealer should be able to read a key signal rather quickly. Finding what the issue with the RF antenna is another story.
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post #5 of 6 (permalink) Old 06-29-2009, 06:11 AM Thread Starter
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I have tried cleaning all signal transmitter keyfob led and door handle sensor windows - no joy.
If i turn round and face away from the car with the key in hand the remote doesn't work. I have got to be within a foot or so of the drivers door sensor, pointing the key directly at it for it to work. The passenger door sensor doesn't appear to work at all. Even if i put the fob within 6 inches of the sensor it still doesn't work.
I'll have to take it to the dealership. Its getting on my nerves, especially when i get out of the car and i'm carrying something.
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post #6 of 6 (permalink) Old 06-29-2009, 07:28 AM
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AE6500,

I'm sorry my suggestion did not help.

Good luck with the dealer and please post back with an update.

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