iPhone s7 and Pioneer radio connection issues

[Semi85]

Hey Guys 

i have a Pioneer radio in my car avh-6300bt

Mand yes its iPod prepared but when i connect my phone by cable it sees the telephone it shows me format read and then it says ready but as soon as i hit start on my phone to play a song it starts the Song on my phone but i get no sound from the radio or phone, before i used the s6 no problems what so ever ! Can anyone help??