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This is the Axxess AXGM-01 / GMOS-01 data bus radio replacement interface. It is a required install part if you wish to change the head unit in a GM vehicle between the years of 2000 - 2013.
If the vehicle is amplified either use the GMOS-04 interface or bypass the amplifier. If bypassing the amplifier follow the Axxess Interface Amp Bypass Schematic document.