Built in option for Bose, Monsoon and Y-91 audio systems – Retains factory Safety features and Chimes in your Gmc Envoy Needed when your cars has Class II Data Bus and and not sure if it has a Factory Amplifier – Best Choice for Install Shops
Plugs into your Factory harness – Retains chime functions such as: seat belt, check engine, key in ignition, low fuel, low oil and lights on.
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