It works for me, not 100% though. All the radios have to be tuned in the SRS overlay. On center console, radio panel you need to manually turn up all the radios individually and make sure they are depressed for monitoring(left click to depress, right click to lift). Also on the same panel is a master volume control need to turn that up as well. The back up radio (ARC 186) on the back of the center console has its own volume control as well. I have been unable to tune this radio since the latest SRS update. You can tune it on the panel, but make no difference in the SRS overlay. Hope this helps.
Brigantine's post in SRS with Chinnook. was marked as the answer