Metra XSVI-2003-NAV XSVI-NAV Interface GM 05-UP Provides accessory (12 volt 10 amp) Retains R.A.P. (Retained Accessory Power) Used in non-amplified systems or when replacing amplified systems Provides NAV outputs (Parking Brake, Reverse, Mute, and V.S.S.) ASWC harness included (ASWC not included) The XSVI Interface series provides a 12V accessory power output that uses data control signals instead of conventional power signals 12 Volt Accessory Interface The XSVI-2003-NAV 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