I am not sure what year your 24K is but it sounds like they changed the head unit from the Pioneer unit they put in a 2016 model. If yours is like mine, be prepared for a rats nest behind the head unit. If you need to know how to remove your Garmin head unit from the dash let me know.
2016 Melbourne 24K
2013 Sprinter crew cargo used for work now
2002 Toyota MR2 Spyder as a Toad