Audi A4 Avant 2002 - Radio and CD Changer Wiring Check; Checking Wiring Integrity

91-50
Checking wiring between radio and CD
changer
- Switch off radio.
"Concert II" radio:
- Press CD button on radio and switch radio on at
the same time.
"Symphony II" radio:
- Press button "4" on radio and switch radio on at
the same time, keeping the ON button pressed
in.
All models:
1. Wiring OK
Indicated on radio display:
"CONNECT"
Audi A4 Sedan 2002-2004, Audi A4 Avant 2002-2004, Audi A4 Cabriolet 2003-2004 - Communication