Taking off the seat beltsTaking off the seat belts  - How to wear seat belts properly - Seat belts - Safety - Audi S5 Owner's Manual - Audi S5

The red button releases the belt from the buckle.

Fig. 175 The latch plate of the belt springs out of the buckle
Fig. 175 The latch plate of the belt springs out of the buckle

Ц Press the red button in the seat belt buckle ⇒ fig. 175. The latch plate will spring out of the buckle.
Ц Guide the belt back by hand so that it is taken up by the retractor.