Hi, my pioneer deh-p2900mp audio button is not working. I coulndt find anything on the internet or the manual. Basically when i press the button nothing happens, It was working fine in my last car and i switched it over and it worked for about two weeks and then one day it just suddenly stopped. I dont know if theres a mode that locks the audio button out or if i could reset it or something..? if i could get some help that would be super!!!
I would use the remote to see if the function is still available, if it is then it might be a faceplate issue, either dirty contacts in the back or in the switch itself if you used frequently.
In any case is pretty old budget unit it will cost you little to replace if needed.