If the customer purchased a RA2, Once they installed the RA2 they are unable to turn the volume up, as it is fixed at 1 as the volume level... it is a fuse that has gone bad.
Have the customer check fuse F52 for Battery Sensor.
2013-2017 RA2 Can't Adjust Volume
Audio Fuse check
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Written by David C Funk
Updated over 4 months ago