Stock tire size is 225/55/17 but I am wondering if 225/45/17 will work wheel size is 17x7 1/2.

 

https://tire-calc.com/

One lf many tire calculators I found on google.
Any change in diameter >3% isn't compatible with the computers. The AWD has reliability issues at >1% difference between front and rear.

[Edited thanks to Slartibartfast below.]

 

Overall tire diameter change can be as much as 3% before the computer complains bitterly. AWD transfer case can have reliability issue if front/rear difference is greater than 1%