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The "Tunnel" Function in the Mercedes C-Class W204

Model: Mercedes Classe C W204 - Years: 2007, 2008, 2009, 2010, 2011, 2012, 2013
Part: Checks and maintenance

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Video tutorial

In this video, discover a hidden feature of your Mercedes C-Class that not everyone may know about: the so-called "tunnel function" allows you to close all the windows automatically when entering a long tunnel with a single action. Press the central button on the climate control dial, located on the right side of the climate control panel.

This button has a picture of a car on it. Press this button for three seconds, and all open windows will close automatically. Upon exiting the tunnel, simply press this button again for three seconds, and all the windows will return automatically to their position before entering the tunnel.


Updated on 20 October 2026 by ScegliAuto


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Where is the cigarette lighter fuse on the Ford Fiesta?

The fuse for the cigarette lighter socket on the 2010 Ford Fiesta is located inside the fuse box within the vehicle. Specifically, the fuse is found in the driver’s side glove compartment. To check the fuse after confirming that the socket is not working, you need to remove the entire compartment. The relevant fuse is numbered 6 and rated at 20 watts. Once you have removed the damaged fuse, insert a new one to restore proper function to the socket. If the problem persists, it indicates an issue with the control unit, in which case you will need to visit a garage for a diagnostic check.

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