i have enable AUX in the green menu and also plugged a cable into the AMI and selected aux as the media source
As long as you're able to select AUX as the media source I think you should be good on that side.
Does 2G equal Concert/Symphony? If so, you might want to try validating that "mobile device interface" is disabled. See page 12 of this
installation manual. The middle picture.
2 other possible options could be checking the devices volume levels.
1. From the home screen go to Settings -> System volume
2. This is far fetched but who knows; change the volume levels through the engineering mode. Normally this is a procedure you use to fine tune volume levels to your system, meaning you already have audio but you want to limit or increase the maximum volume that the physical volume controls can go to. I recorded a small video how to get there; https://www.dropbox.com/...0jcr1r/IMG_6283.MOV?dl=0
Note: in the final step I went to "media" but according to the video in the instructions here
you should actually adjust "SIP".