Listed here for sale is a good used Volvo XC-90 Headlight switch.  This unit functions properly.   Please see picture.

This unit was checked for normal function, it works great!  Your best bet here is to compare part numbers to be sure you are getting the correct switch.  Even inside of the fitment range, there are several different variants of these depending on your specific cars optional features.  You want to be sure you get the correct switch!

 List price at Volvo USA was previously nearly $180! get this one for less than you would pay in tax at the dealer! I only sell the OEM units, never aftermarket so they are the same quality as your original. 

I will offer a 30 day functionality guarantee ,Thanks for looking and good luck!