DIY: How to get AUDI Concert Radio Out of "SAFE" Mode
This works on Audi Concert II cd/radios from 2000-2006 commonly installed in the Audi TT, A3, A4, S4.
Step 1: Turn on radio with left button.
Step 2: Hold SCAN and RDS buttons simultaneously.
Step 3: Use keys 1,2,3,4 to input code. You will need to press each button more than once.
Step 4: Once code is complete, press and hold SCAN and RDS buttons to complete. Radio will now turn on!
-German Audio Tech