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Sat Nav screen


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Mine is the same, seems to be a light sensor behind the screen or somewhere. Example, a short period of reduced light (under a bridge for example), the headlights come on. A longer period of darkness ie a tunnel, lights on and screen dims with black background.

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Different sensors.

The lights use a sensor located behind the rear view mirror.

The instrument panel, including the satnav screen, uses a sensor located at the bottom of the windscreen. It's a round black disk, about the size of a 50p coin, located either in the middle of the air vent at the base of the windscreen or on the very far left on the passenger side.

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On the RC the dash top mounted sensor is for the lights. The sensor on the RVM is for auto dimming mirrors. I haven't found the sensor responsible for the sat may screen. On my Mercs that sensor was actually within the screen itself.

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