I also replaced the switch and it did not solve the problem. I refuse to take it to the dealer because they already screwed me once when I bought the truck so I will continue to troubleshoot it on my own.
I have a 2015 silverado 2500 HD and the wipers run at the same speed on low and high. I have searched everywhere and cannot find any information on a fix. I replaced the wiper motor and it did not fix it. The fuse is OK. Anyone have ideas?