Audi A4   Controls   Lights and vision  Interior lights
The background lighting of the instruments, the centre console and the 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 needles on the dials in the instrument cluster are illuminated when the ignition is on and the exterior lights are off. The illumination 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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