U1000 Cadillac -

Question

i have a 2000 deville limo the rear doors don't no lock with the auto lock button. the rear windows will not roll down. I UNPLUGGED THE WINDOW MOTOR AND PLUGGED ANOTHER WINDOW MOTOR I HAD THAT I NO IS A GOOD WINDOW MOTOR AND THE MOTOR WILL RUN IN THE UP POSITION BUT WONT RUN IN THE DOWN POSITION.SO I NO POWER IS GOIN TO THE DOOR.I HAVE A U1000 CODE IS THE DOOR MODULE BAD OR COULD IT BE FROM THE U1000 CODE.ITS A RIM U1000 CLASS2 DATA LINK MALFUNCTION.