ginho

hi

i'm having a problem with an did i done. i have it on my car and audi chorus, with the red and black display, and i changed to a radio concert with color display, everything is working exception for the sound, when i tried to increase the volume it simply doesn't work, no sound bar appear, but the volume button works to turn off and on and mute. anyone did this did, or anyone now wich problem can be? (also the airbag light is on now, after i did this did)

kind regards