One complaint I had with my 2010 Impala was that the turn signal flasher was not loud enough. Knowing that it was integrated into the BCM and/or radio, there was no way to change to a different flasher. So I decided to live with it. Out of curiosity, I looked at the chime setting which was at "normal'. I chnaged it to "loud" and it also changed the volume of the turn signal flasher volume to an acceptable level. The owner's manual DOES NOT mention this, and a search here did not find anything, so I felt that I should post this as it might help others.