High Beams not Working - Replace Relay?

I need help with my 2011 Prius. The high beams haven't worked for months - both went off at the same time. No click when I push the indicator. Headlights work just fine still. I've had the bulbs replaced and inspected the fuses as well as the connections and harnesses - everything seems to be in fine order. I'm assuming then that the problem must be with the relay. Does that sound right? If so, which relay would cover the high beams? I brought the car to AutoZone, AAP, and had it checked out by my oil guys - they say it's proprietary relays so has to be done at a Toyota dealer, but sounds like $$ that I don't have. Ideally would like to order the part and replace myself, but no idea which relay this would be. Any help appreciated!!