Mute on reverse is ON in the SOUND menu:
Go into the SOUND SETUP menu and turn the "mute while backing up" OFF
Created On: Sat, Oct 14, 2017 at 12:54 AM
Last Updated On: Sat, Oct 14, 2017 at 12:56 AM
Authored by: Alpine KB [alpinecustserv@alpine-usa.com]
Online URL: /article/sound-mutes-when-vehicle-is-shifted-to-reverse.html