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The GMOS-LAN-034 is designed to retain Onstar and to retain warning chimes that are normally lost when 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 a reverse output to make installing an aftermarket navigation radio simple and less time consuming.The GMOS- LAN-034 works in both amplified and non amplified systems.