Put in a new cd player and now my maintenance (DTE, MPG, tire rotation etc.) Doesn't show up when I hit the buttons...is this normal after HU swap or did I forget to plug something in?? ( 04 maxima non bose or navi)

 

Maintenance stuff should still work. You will only lose the radio portion of the display (station info, cd, etc). The clock, AC/heat, and temps will still work as well. Double check to see if everything is plugged tightly.