External Audio Source Connection -R199-, REMOVING AND INSTALLING: Notes
WARNING: This page is about a different car, the 2021 Audi S4 and 2021 Audi A4 Quattro. However, it is still accessible from the selected car via links, so may be relevant.
The External Audio Source Connection -R199- -1- is located in the center console storage compartment -2-.
Fig 1: AUX IN component location - USB Connection Baseplate -R193-