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  #1  
Old 10-22-2003, 10:42 PM
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Join Date: Jul 2003
Location: Chicago
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Problems with electronic key

My brother owns a 99 430 E. One of his keys went dead after dropping it. He replaced the batteries, but the key still does not function. Mercedes wants $260.00 for a new one. Is there anything that is common to them not functioning, and can it be serviced. I have a complete electronics lab at my disposal to anaylize it.

PeterG


92 300D 2.5
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  #2  
Old 10-22-2003, 11:05 PM
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Does it not unlock the car, or not START the car?

I don't believe that price is correct, should be half that (still tooo much I know), but about $125 is what they cost.

Gilly
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  #3  
Old 10-23-2003, 08:02 AM
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I just bought mine. But not similar as yours i.e 1996 model. It cost 110USD.
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  #4  
Old 10-23-2003, 08:55 AM
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remote

Have you gone thru the resync proceedure with the service rep, It is in the owners manual (something like aim the remote, push the button and unlock with the key) they loose sync if the batteries are out too long. Mine went thru the washer and i had to dry it out and then resync.
The other
Peter G
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  #5  
Old 10-23-2003, 09:56 PM
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Until we know what it's doing wrong we can't help much. The resynch procedure may be good to do if it won't lock/unlock the car. if it won't start the car you may as well throw it away.

Gilly
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  #6  
Old 10-24-2003, 09:27 AM
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Thanks for the response.

I know he hasnt tried the re-sync procedure. When you insert the key in the ignition, the first thing that happens is the wheel un-locks, without turning the key. Then you can turn the key to start the car. When he inserts the key, he gets nothing. A friend of mine thinks they use a laser diode much like a remote for a TV, but a higher quality. When you insert the key in the ignition, it transmits its signal to a reciever in the wheel. Does anyone know if this is true? The front of the key does have a red lens on the front of it, so maybe it is an infared type signal. (Like a T.V remote). Somebody must know.


PeterG

92 300D 2.5
79 300 SD
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Old 10-24-2003, 05:38 PM
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Well of course someone knows, but I AIN'T talkin'!!!

OK, OK, I'll talk.

It uses 2 transponders in the key to start the car. If it's not working to start, something happened to one or both of the transponders. If you have access and want to explore or experiment, hey, it's HIS key, go ahead and try, nothing to lose. I can help explain how to disassemble it if you need help that way.
One of the transponders is a fixed code, one is a rolling code.
The transponders operate without any battery power at all, the batteries are for remote lock/unlock only, and also for the convenience features (rolling up and down of windows and sunroof, which is an IR function (red lense).
Do any of these features work?

DO NOT buy a key from EBay, or a junkyard or anything else but a new dealer key. Smartkeys are vehicle-specific, you can't "train" a key to work on an incorrect vehicle.

Gilly
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  #8  
Old 10-25-2003, 10:43 AM
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Thanks Gilly,
I know I could get someone to squeal, Just kidding. I will let you know what I find, and if it is not security sesitive, I will post pictures and information.


PeterG


1992 300D 2.5
1079 300SD
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  #9  
Old 10-25-2003, 04:55 PM
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OK, sounds good. You first need to know how to replace the batteries, that may be in the owners manual. I am fairly sure that at least one of the transponders is actually in the tip of the part the batteries slide in to.
Once the battery retaining part is removed, you can look at the butt end of the key (the end the battery holder slips in to), and you'll see a small wire retainer. Remove that and the rest of the guts of the key will also slide out.

Gilly
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