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i heard once that if you point the infrared key to your head and press lock/unlock button you can improve distance, this might work?
your head will work like a transmitter, i have never tried it.
Last edited by KJI3jflarryfe93; Jul 31, 2014 at 08:45 AM.
my original key also made me stand 3-4 feet from the car, but my new silver key works from inside my house! (about 50 feet away). My 98 has the original key and also makes me stand 3-4 feet away... I can't even open the trunk from the rear, I have to stand by the drivers side door to open the trunk with my key
Where are you guys getting the replaement keys? Mine originally came with keyless entry, but the infrared key fob has been lost some where along the way. The dealer wants $250 for just the fob, which I think is a little ridiculous since I can buy a plug and play keyless entry, with two flip key fobs for $160. And it would probably work better than the original system.
Yeah, I don't want to spend that much, I'd rather save my money and buy an after market system, lol. I was hoping you guys had some super secret place to get them at a reasonable price.
Well, as far as I know, our cars never got transponders in the key, at least I know that mine does not. The Keyless system that I was looking at had flip key remotes with the correct key blade for the w202, so all I would need to do is have a lock smith cut the key for me.
in germany you can buy replacement key housings
there are 506 auctions from various sellers
most sellers ship within european union, if you email seller and asking if they want to ship to US you might get lucky?
happy hunting
I am currently chasing same fault but it's intermittent making it hard work..
DAS3 use's Radio frequency and Infrared combo,if only working at close proximity you have radio pickup problem maybe antenna,anntena amp or N70 overhead control panel??
I believe faults on CAN B system can also make trouble with the locking system,front door modules DCM1/2 recieve your infrared signal and when rear door moduals DCM3/4 fail they can cause CAN problems on DCM1/2 which cause intermittent failures of key access...
i think your right, CAN need to be followed to see what could interrupt EIS>>infrared, i heard one member owned W210, got the same a problem with CAN bus DAS3 either,,
im not that good expert of CAN system management...
Sure no problem,I think any faulty module on same CAN system can interfere and cause bad data. common fault like this is when driver side window no longer works but disconnecting battery fixes for a while,maybe try disconnect battery and see if this helps?, also remove your OCP and make sure all plugs are pushed in well.
I might have learn't something new today CLk55 key uses different radio-Hz in OCP,so my c43 OCP does not pick up clk55 radio frequency. on the back of my 99 c43 OCP there is a sticker showing 433Hz,00 clk55 has 315hz =).when I swap back to C43 EIS and key the longer range locking works again. MB has plenty of tricks
It is possible to check key signal actuation for infrared and radio in SDS, maybe this will be best way to diagnose?
As far as I know key radio signal is recieved via vehicle radio antenna > antenna amp>overhead contol panel (OCP)>EIS.
OCP
I dont think any signal goes via audio player FM/AM radio, but I am suspesious because when I purchased my c43 the remote only worked close proximity, after i install clk55 ignition it's still the same but now I change back to c43 eis, ecm, steering lock and now long range key works, only thing different from before is I have clk55 FM/AM radio installed
I just tried change over to clk55's OCP, ECP shows as being used in W202 also, now clk55 key/EIS works long distance! only rear windows still not working from EIS coding.
When I tried it earlier the clk55 OCP did not work, maybe I did not plug in correctly.
Edit - Looks like frequency changed with newer style key,newer style keys must be set up with older frequency when being replaced on the 202?.
Thanks Zayed 100x100 is soo small I could only fit one wheel
Maybe try disconnect/reconnect OCP in case plugs are loose,if still not working you really need SDS to look at OCP and see if radio signal is received,also can check DCM1/2 module to see if infrared received etc. maybe its time to buy Chinese SDS?
If you have a spare OCP from same era 202 you could swap to test?..
Does your FM/AM radio/stereo have good reception?..
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Key Infrared
!, 
?
, only thing different from before is I have clk55 FM/AM radio installed
