Using remote the locks work fine until outside temperatures get cold.
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2002 Mercedes-Benz S430 Question: remote door locks do not work at low temperatures
There may be moisture in the pump or vacuum lines, did you try using the blade key in the truck to check operation, if that works the fob batteries may be weak.
ReplyVisitor, February 21, 2011, 20:10
Thanks. I"ll look at that. Pump located under rear seat?