Flashing lights problem

Hello,

After a long time I went to use my Prius III, unused because of coronavirus and working from home since the start, all my flashing lights wont work, when i try to use them there is a buzzling sound in my dashboard. I put my car in december 31 at my closest Toyota center but they gave me back the car after few months, and checking some basic things, because "they don't have time to look after it and it will cost me too much to repair it". The car itself works fin exept the flashing lights. Any Idea where to look, I'm starting to feel desperate.

Thanks for your future answers.

Paul

 

Thanks for your answers, the battery is new and the same model of the last one, and they changed the flasher unit. They told me an electrician should check wire by wire and that will cost a lot.

 

That's the relay, they changed it and the problem remains