Metra Axxess GMOS-LAN-034 2006-Up Gm Vehicles Gm-Lan 11 Data Interface HarnessGM LAN11 Data Interface Harness GM 2006 up GM Factory Integration Interface OnStar and Chime Retention Module for 2006 Up Select GM Vehicles The GMOS LAN 034 is designed to retain OnStar and to retain warning chimes that are normally lost when the OEM radio is removed. It also provides a 12 volt accessory output for aftermarket radio operation. The GMOS LAN 034 also provides a Mute, Parking Brake, Vss or Speed Sense, and reverse outputs to make