2012 Audi A4 / S4 — Owner's Manual
The low beams only illuminate with the ignition turned on. With the side marker lights or headlights switch ed on, the symbol next to the light switch illuminates. AUTO - Automatic headlight control. With the switch in the AUTO position, the low beams are switched on automatically depending on the ambient light, for example in a tunnel, at dusk and when it is raining or snowing.
When the low beams are switched on, the: symbol comes on. The low beams remain switched on regardless of the ambient light when you turn on the fog lights. When you turn off the ignition, the low beams are automatically switched off. On vehicles with a rain sensor the headlights switch on automatically after a few windshield wiper passes.
However, the instrument lighting will not be switched on. With automatic headlight control, you also have the high-beam function available. However, if you have not switched high beams back to low beams while driving with automatic headlight control, only the low beams come on the next time you turn on automatic headlight control. In order to return to high beams again, you first have to pull the high beam lever back to the normal position and then push the lever forward.