Metra GMOS-LAN-04 car kit

06-UP GM LAN Harn w/Onstar/Amp THE GMOS-LAN-04 INTERFACE IS DESIGNED TO ALLOW THE USER TO REPLACE THE OEM RADIO WITH AN AFTER MARKET UNIT IN AMPLIFIED 2006-2008 GM VEHICLES THAT USE NRE GMLAN DATA BUS SYSTEM AND RETAIN FULL FUNCTIONALITY OF THE ONSTAR SYSTEMS AS WELL AS ALL SAFTEY AND WARNING CHIMES THE GMOS-LAN-04 WILL ALSO RETAIN THE RETAINED ACCESSORY POWER CONVENIENCE FEATURES. THIS INTERFACE HAS THE CAPABILITY OF ADJUSTING CHIME AND ONSTAR VOLUMES AS WELL. IN ADDITION TO THESE FEATURES THE GMOS-LAN-04 NOW HAS THE REQUIRD OUTPUTS FO THE INSTALLATION OF A NAVIGATION RADIO