You can remove it just by removing the two screws and lowering the bracket. Then you remove the one screw holding the module to the breacket and get it off the bracket. No need to remove anything else off the dash.
Here is how to fix the problem you are having
I just fixed mine today (as the other one I got from Pick N Pull was also very quiet.)
I dicked with it for over an hour ad figured out what works
Open the box (2 snap locks) and remove the E bar, and lift the board up at an angle and slide it out.
You'll see the the 'speaker' that is held in by 4 clips - you can release them from the other side
Split the plastic piece from the metal disk.
Remove and discard the foam and try to clean the disc using alcahol or something. On the one in the car I got all of it off very easily, this one is gummed up bad. Be careful with the disc.
Next grab a dizzy o-ring ( I know everyone has a few of these laying around their garage ) and use it in place of the foam. I did have to cut about an 1/8 of an inch off of it for it to make a smaller circle so it could fit in.
Snap on the black palstic holder on (make sure all 4 tabs lock). It will feel a bit snugger going back on.
Carefully insert the electronic board back on there and insert the E bar. Snap the caver back closed and you should be in "biddness"