Where is the sensor that turns the headlights on and also the sensor that turns the sat nav into night mode thank you

Lanerider said:

Where is the sensor that turns the headlights on and also the sensor that turns the sat nav into night mode thank you

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It's behind the windscreen I believe, at the top, where the rear view mirror mounts.
There's a couple of sensors there, one of them will be for ambient light measurements, there's another for rain sensing.

I'd run a diagnostic on the CJB, to see if it flags up an error on anything relevant.