Hi everyone. I have a 2010 Chevy Impala LS with Wiper Issues. Put a new wiper motor, fuse and switch in, but won't run on high speed and does not shut off correctly. Stumped. I believe the relay on this year Impala is not accessible. Not sure what to due next. Mechanics in My area shy away from electrical issues, and Our main Chevy dealership in town wants a fortune to check it, let alone fix it. Would appreciate any feedback . Thanks.