Listed here is a good used Volvo S40 V50 Headlight switch.   This unit functions properly.   This unit is from a 07 S40.  Please see picture.
Checked for normal function before removal, it works great!

 List price at Volvo USA was previously nearly $280! 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!