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 CHGM5C Astra 04-up Vectra 04-up Tigra 05-up Captiva 5 2009-2010 Captiva Maxx 2007-2008 Barina XC 2004-2005 (with Opel Motor 718XE)
