My son has a 2005 S40 Volvo. About two weeks ago, his wipers stopped working as well as the windshield cleaner! I told him to check the fuses first, however, that model has a "relay fuse"

Thank you for writing all the info needed and the problem to make it easy for me to help you,this problem may be a motor but as like you i dont think the washer and sensor and motor would go out, i have enclosed pictures of the fuse boxes you will need to check, this car has four of them, you will first check the fuse, theres a 30amp fuse located in the engine compartment, you will locate the fuse which controls the wiper module, if theres no power to this module nothing will work, check fuse at location F-17 this will be a 30amp fuse for the wiper module. the diagram will show you the fusebox location and the fuse location, the next place is behind glovebox theres another fuse/relay box, theres a picture of that box also, you will be looking for postion F-48this is the relay for the wipermotor, you will need to swap another relay with the wiper relay to test it.good day and hope this is helpful.