2000 Ford Taurus Power mirrors don't work

I just purchased this vehicle and both the power side view mirrors don't work. According to the owner's manual, the mirrors are on the same circuit as the power antenna, which is working fine, so I know it's not the fuse. I've tried putting in 2 different switches, but that doesn't work either. I have power at the green wire at the plug, but that's it. As both mirrors won't work, I'm thinking the problem is common to them both, perhaps a bad ground? Where can I find a wiring diagram online for this? Thanks for your help!