The answer is no, VLine does not disable any factory features such as AC controls, backup camera, or access to your AM/FM radio. Please see quick snap shot here:
Simply press any other buttons of the stereo. All original functions of the factory stereo system are not affected by VLine installation. You can still access your FM radio, climate controls, backup camera, etc.
Note that on select Lexus and Infiniti stereos some functions such as factory USB or XM Radio might be disabled with the installation of VLine, so always check your specific configuration.
All limitations are listed on the website under product description.