Steering Wheel control Primary harness adapters convert the commands from your car's steering wheel controls to a code that an aftermarket radio can recognize. A patch lead is also requires for SWC type systems based on the brand of head unit you have. for more details check out our you tube video. http://aerpro.com/video/control_harness_installation CHPC1C Retains factory reverse audio Citroen C2 2006-> Citroen C3 2006-> Citroen C4 2006-> Citroen C5 2006-> Citroen C8 2006-> Peugeot 307 2005-> Peugeot 407 2005->
For vehicles with factory reversing sensors*
*Please note these will work in amplified systems but the Reverse Buzzer becomes extremely loud.