I have a Pioneer AVH-X3800DAB unit installed in an A class. ( Don't know if that makes any difference). There are two Pilote speakers in the back of the hab area, which work fine. There are also two speakers in the front footwells. I get no sound from these. When I look at the audio settings on the head unit, 17/19 settings are dimmed, so I can't change balance or anything that might be affecting the volume. The manual tells me I can choose "Standard" or "Network" configuration for the speakers. This choice should be offered on first installation or by doing a reset. I've done a reset, and guess what, no choice offered to change this. So, I'm stumped. I don't even know if this would solve the missing sound, but no idea what else to try. I've had a look at the back of the unit, and there are no connections to the phono sockets as I would have expected. I think there must be some clever wiring been done. Aaargh!