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

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.