RR rear wash

I don't know about the specifics of your vehicle, but on mine, the rear washer has its own pump that resides near the washer reservoir. I'd see if that's making any sound, unless that's what you're saying that you already checked. If it is, there's perhaps a blockage. If it's not, maybe a new pump. good luck, Tor

also worth checking the switch itself is working and that the connections at the pump itself are ok. If you have power to the connections, try tapping the pump with a screwdriver just in case it's "sticky".

A test lamp is a big help, or a multimeter. Dont know which fuse covers it, but there will be one - probably covering somethiing else as well. Anything else not working? Phone a dealer - they'll tell you.

Mike.