Check the contacts on the battery tray part of the key.



The contacts were bent on my G Wagon key, and it wouldnt unlock or lock the car. Bent then back so they make contact, and voila, unlock and lock work again.

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-Justin

91 560 SEC AMG - other dogs dd
01 Honda S2000 - dogs dd
07 MB ML320 CDI - dd
16 Lexus IS250 - wifes dd

it's automatic.