2003 Chevy Suburban Wipers will not turn off.

Reguardless of what way you turn on the wipers, mist, intermit, or full. The wipers don't turn off when they should. If you let them run for a long time they eventually turn off, and sometimes when you turn off the truck and open the door to turn off the acc power they will usually be off next time the truck starts. In the winter when the temps are cold here in Minnesota sometimes I have the problem where the hazard lights come one with turning on the turn signal. I replaced the module in the steering column, with a rebuilt module, and have the still have the wiper problem, I don't know if I have the turn signal problem. What are the parts that I should look at. My next plan is to get a better module and replace it in the steering column, and then replace the controller in the wiper motor.

Thanks
Jake