Axxess XSVI-2105-NAV Non-Amplified Non-OnStar Harness to Retain Accessory Power The XSVI Interface series provides a 12V accessory power output that uses data control signals instead of conventional power signals 12 Volt Accessory Interface Provides VSS (Vehicle Speed Sense), parking brake, and reverse signals to an aftermarket navigation receiver, making the installation easier R.A.P. (Retained Accessory Power) function is retained