Well, I'm new here.. so.. hey, I'm Russ :angry: Proudly driving a 2006 2L dark red c4. so, a couple things I've learnt so far.. and something I'd like to.. 1. anyone trying to hook up an aux in can use pins 4 ,10, and 11 for R, L and ground respectively. I used some mothorboard wiring (the ones for like, the lil speaker and switches..just seperate them with a cutter.. they fit perfectly).. these, naturally, go into the part that actually has pins 4, 10 and 11. they can connect directly to any headphoen jack or mini jack or rca (I have a little rca 'selector'to switch between different sources).. you just need to get citroen to activate "Aux 1". the volume is a bit soft.. so maybe I'll build a lil amp.. belkin has some ipod thing with an amp built in.. hmm.. anyway, that works on my standard blaupunkt RD4 (the basic single cd no mp3 system thatcame in my C4) 2.another thing anyone may want to know is that the seatbelt switches are wired with a little plug under the seats that are easy to find (near the back of the passanger and driver seat) .. just unplugging these leaves the system thinking you're always strapped in. (I like to plug and unplug in the driveway.. so..) 3. the guy at citroen told me that if you save a radio station wile RDS has been dissabled, it'll be dissabled for that station. now, default rds.. can be annoying.. so I'll try see how that works.. he also told me the display and a whole bunch of other stuff work off the radio so removing it in favor of a third part option may be problematic. he advised I keep it connected.. say, run it to the boot or something. does anyone know more about this? I'm considering one of the pioneers that have buit in bluetooth.. and try find their control connecter thats supposedly connects to the C4 steering controns.. so, my Q: anyone done any installation that includes keeping all functionality of the display while maintaing steering control support? would be much appreciated. else.. wish me luck :) -Russ.