Hi folks! I viewed / test drove a B9 2017 A4 sport earlier today and think something might be wrong with the rear A/C but I just don't know enough about the car to tell if it's normal. Hoping someone can help. The temp display in the rear is not lit up. There are no numbers / temp displayed on it. Just blank. The illumination for the + and - buttons in the rear are lit. From the front of the cabin, The option for "set rear" is there but it's greyed out and I can't select it? There are no errors or notifications about a fault anywhere so am I just missing how to use it correctly or worse, is something actually wrong? The car was otherwise lovely so this is a deciding factor on if I walk away from buying the car. Thanks in advance for any help.