![I have a 2001 Audi TT quattro and when my battery died the stereo system came back on in "safe" mode. I have my manuals, I have a 2001 Audi TT quattro and when my battery died the stereo system came back on in "safe" mode. I have my manuals,](https://ww2.justanswer.com/uploads/mikeamechanic/2010-04-11_033218_86295920.jpg)
I have a 2001 Audi TT quattro and when my battery died the stereo system came back on in "safe" mode. I have my manuals,
![Audi Workshop Manuals > A4 Mk3 > Vehicle electrics > Communication > Infotainment > Radio system (USA) > Connectors for "concert" / "symphony" radios Audi Workshop Manuals > A4 Mk3 > Vehicle electrics > Communication > Infotainment > Radio system (USA) > Connectors for "concert" / "symphony" radios](https://workshop-manuals.com/audi/a4_mk3/images/a4-15197.png)
Audi Workshop Manuals > A4 Mk3 > Vehicle electrics > Communication > Infotainment > Radio system (USA) > Connectors for "concert" / "symphony" radios
![Symphony Concert Radio Retrofit Wifi Carplay Android Auto Device For Audi Q5 A5 A4 B8 2009-2016 Without Mmi Apple Carplay Box - Buy A4 B8 Carplay,Wireless Android Auto,Carplay Video Interface Product on Symphony Concert Radio Retrofit Wifi Carplay Android Auto Device For Audi Q5 A5 A4 B8 2009-2016 Without Mmi Apple Carplay Box - Buy A4 B8 Carplay,Wireless Android Auto,Carplay Video Interface Product on](https://sc02.alicdn.com/kf/H3c63bc89e2c046ec9b66e07427d88f876/234797698/H3c63bc89e2c046ec9b66e07427d88f876.jpg_.webp)