Is it any window or one certain window. I would still get my battery and charging system checked anyway. If it is one certain window you might what to have it checked due to it pulling alot more power than the others. Blinking or kinda lightly flashing headlights is a sign of an alternator problem. I would also check my battery connections.
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Sounds like the pod as failed this unfortunately does tend to happen and will need a new unit fitted Classic signs of processor failiure in the dashpod until it warms up. Tell the dealer this and to ring Audi Customer services - they will inform the dealer that the policy is now that all faulty dashpods are to be replaced free of chargeand regardless of mileage, age, service history, or country of first registration. i.e. all TTs regardless.
Check your alt.. alt voltage output should be at least 13.2, sounds like it's not charging and your possibly running off the battery, as for the dash and tail lights, there both on the same system, check the fuse.
Did the window go down like normal or was it sluggish? If sluggish it could be the motor, sometimes with the key turned on holding the switch in the up position pound on the trim panel middle or slightly below center with your hand if the window starts to move it's the motor. If the window went down normally it's probably the switch. Look at the dome light when operating the switch if the light dims it means the circuit is complete and it's most likely the motor, if the light does not dim the switch or wiring is bad, try the switch first. One word of caution changing a motor can cause bodily injury if you've never changed a motor before take it to a mechanic as the regulator is spring loaded!
Could be a loose or dirty battery connection, poor battery, or alternator. Check all the cables and connections to your starter. Clean your battery posts. Have your alternator and battery checked. It sounds like you are either running off just the battery or just the alternator. One of them is not right.