Windsheild wiper don't turn off even with the key off.

The wipers on my 2008 Chevrolet 2500 don't shut off. The only way to get them to turn off is by pulling the fuse. At the wiper motor, I have power to the green wire all the time and to the purple when the switch is on high but only one wire at a time has power. I unhooked the light green (keyed power) from the BCM and the wipers still have power to the green wire. Putting it on high only puts power to the purple wire when the key is on. I cant find a relay the fuse box that controls it. Where do I go from here? Thanks