Metra AX-ADXSVI-GM4 04-Up Gm Ad XSVI Harness Provides accessory (12 volt 10 amp) Retains R.A.P. (retained accessory power) Used in non-amplified systems, or when replacing amplified system except for those marked with a * Provides NAV outputs (parking brake, reverse, and V.S.S.) Prewired ASWC-1 harness included (ASWC-1 sold separately)