r&i rear bumper cover for minor repairs and paint,all of the sensors were removed before,starting repatrs,and they did not get painted! when I put the car together the ,parking sensors are not working,when I looked for the problem,every thing looked normal,meaning wire harness and all connections! can any one help me with something I can do other than taking it to a caddy dealer? Thanks chris

You're probably going to need a scan tool to really get down to the nitty-gritty.
Do you see any Park Assist messages on the Driver's Information Center (DIC)?
Was the battery disconnected (for an extended period of time) while the bumper cover was being serviced?