key remote

A smart key is a vehicular passive entry system developed by Siemens in 1995 and introduced by Mercedes-Benz under the name "Keyless-Go" in 1998 on the W220 S-Class, after the design patent was filed by Daimler-Benz on May 17, 1997.
Numerous manufacturers subsequently developed similar passive systems that unlock a vehicle on approach — while the key remains pocketed by the user.

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    Door central locking causes single alarm beep and won't lock

    My driver door central locking button stopped working (seems fairly common) so I got it replaced today under warranty. The repair seemed okay at the time as it unlocked the car fine. However now the central locking buttons on BOTH doors cause a single alarm beep, like something has been left...
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