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 CHMZ1C Bose Amplified Mazda CX9 2009 up with BOSE Audio
Hide Compatible with This product is also known to work in the following vehicles: Mazda CX9 2007-2010 TB Mazda CX9 2011- TB