Instruction book AUDI A6 Versión year 2014
Audi A6  Setting off  Lights and vision  Interior lights
The background lighting of the instruments and displays (including the head-up display*) can be adjusted as required.
Briefly press the knob to release it.
Turn the knob towards "-" or "+" to reduce or increase the brightness of the lighting.
Briefly press the knob again to engage it.
Note
The instrument lighting (for dials and needles) is switched on when the ignition is on and the Audi A6's lights are off. The illumination of the dials and needles is automatically reduced as it becomes dark outside and is eventually switched off altogether. This function is intended to remind the driver to switch on the dipped headlights in good time.

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