Installation Steps: Disconnect the negative battery terminal.Pull out on dash instrument/radio dash bezel to release spring clips, unplug connectors and remove the panel.Compress the two plastic side radio mounting clips, slide the radio out of the dash, unplug connectors and remove the factory radio.Plug in the wiring harness connector to the vehicle harness.Connect the other end of the wiring harness with the matching color of the radio wiring harness one by one. Compatible with GM Model the Following: Compatibl with GM Model the Following: Compatible with Chevrolet: Avalanche 2003-2006, Blazer 2002-2005, Cavalier 2000-2005, Colorado 2004-2012, Corvette 2005-2009, Express Van 2001-2002, Express 2500 2007, Impala 2000-2005, Malibu 2000-2003, Malibu 2004-2005 Classic Models Only, Monte Carlo 2000-2005, Silverado 2003-2006, Silverado 2007 Classic Models Only, SSR 2003-2006, Suburban 2003-2006, Tahoe 2003-2006, Trailblazer 2002-2009, Uplander 2005-2008, Venture Van 2000-2005 Compatible with GMC: Canyon 2004-2012, Envoy 2002-2009, Savana 2003-2007, Sierra 2003-2007, Yukon 2003-2006 Compatible with Pontiac: Aztek 2001-2005, Grand Am 2001-2004, Montana 2000-2004, Montana SV6 2005-2006, Sunfire 2000-2005, Torrent 2006 Compatible with Hummer: H2 2003-2007, H3 2005-2010, H3T 2009-2010, SUT 2003-2007 Compatible with Buick: LaCrosse 2005-2009, Ranier 2004-2007, Rendezvous 2006, Terraza 2005-2007