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Can anyone tell me why the central locking switch works only when locking and not unlocking? This is for the 2000 ML 320
 

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2000 ML55
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Likely because the electrical contacts for the "unlock" side of the switch have A) shifted, B) Corroded, or C) are suffering the after-effects of a poorly handled beverage.

Does the remote access on your key still function to both lock and unlock? if so, it is likely that just the switch in your car is faulty. Pretty common fault, and not horribly expensive.
 
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