New member-smart key issue - Mercedes-Benz Forum

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post #1 of 4 (permalink) Old 04-18-2012, 02:32 PM Thread Starter
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Unhappy New member-smart key issue

Hello Benz world!
I am a new member to the site and proud owner of a Mercedes-Benz AMG C-class. 2 weeks ago my well-meaning wife washed some jeans without emptying pockets and my smartkey got a good cleaning. Once discovered she checked to make sure it worked right out of the washer (apparently not a good idea per other postings) and it worked for about 3 days after. It turns on the car but won't lock or unlock. I was thinking of maybe trying some new batteries (suggestions for where to look?) or maybe cleaning out the key itself (any suggestions).
Thanks for the help....trying my best to avoid the $170 new key fee!
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post #2 of 4 (permalink) Old 04-18-2012, 04:52 PM
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Welcome aboard.

Please complete your profile so we know EXACTLY what car you have. Keys change, you know? It's also best to ask tech questions in the proper forum for your car, this forum is really more for a quick "how are you, I am xxx".

If you have one of the newer smart keys, take it apart (remove the battery pack, then the white bar, then the PCB) and blast the electronics with electrical cleaner spray (Radio Shack). After it dries, clean the contact points on it (where the battery pack makes contact) with an eraser. Be sure the shell is completely dried out, too.

Reassemble and see what you have.

Pick up some new batteries, too; it's possible it just shorted itself "on" all the time and drained them. But I'd still disassemble and clean it up before I went any further.

Good luck.

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post #3 of 4 (permalink) Old 04-18-2012, 05:46 PM
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There has been some success by spraying electrical contact cleaner onto the key's circuit board, then allowing it to dry out-- although, this does not always work. The batteries should have 3 volts each, if you can test them...

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post #4 of 4 (permalink) Old 04-20-2012, 04:13 AM
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