Preset button 1 corresponds to the first digit, Preset button 2 corresponds to the second digit, etc. 4 to enter the four-digit code number from your radio card. Do NOT press these buttons again, otherwise the radio will consider '1000' to be the code. Press the P.Scan and RBDS buttons simultaneously and hold until '1000' shows on the display.You must retrieve the code that comes with the Audi's radio unit. SOURCE: i bought an Audi A3 secondhand with audi chorus
