The Axxess AXGM-04 is a premium amplified radio replacement interface designed for select 2000–2013 GM vehicles equipped with factory amplified audio systems and OnStar. This interface allows installation of an aftermarket radio while retaining important OEM functions including OnStar, factory Bluetooth, warning chimes, Retained Accessory Power (R.A.P.), balance/fade controls, and navigation outputs. It’s one of the most commonly used GM integration modules for amplified Class II data bus vehicles. Features & Highlights Designed for select 2000–2013 GM vehicles For factory amplified audio systems Retains OnStar and OEM Bluetooth Retains warning chimes Retains R.A.P. (Retained Accessory Power) Retains balance and fade controls Provides 12V accessory output (10A) Navigation outputs included: Reverse trigger Parking brake Speed sense (VSS) Mute Pre-wired for AXSWC steering wheel control interface Adjustable OnStar and chime volume USB firmware updatable Plug-and-play style integration Specifications Specification Details Product Type Amplified Radio Replacement Interface Manufacturer Axxess / Metra Electronics Model Number AXGM-04 Vehicle Compatibility Select GM Vehicles Vehicle Years 2000–2013 Factory Amplifier Support Yes OnStar Retention Yes Factory Bluetooth Retention Yes Chime Retention Yes Accessory Power Output 12V / 10A Steering Wheel Control Ready Yes (AXSWC sold separately) Firmware Updatable Yes Installation Style Plug-and-Play