Power Mirror won't work Up /right ok Dwn/lft

I have a 2000 GMC Safari with about 145,000 miles. Love driving it and want to keep it going till 200,000. Anyway, the remote powered mirror switch will operate both mirrors Down and to the left but both mirrors do nothing if I try to move them up or to the right. I really would like to be able to diagnose the wiring on the switch and circuit before throwing parts at it. Does anyone have a schematic for this or is there a fuse other than the one near the brake pedal. That fuse is 5A and is ok.
:confused:

It's most likely the control switch on the drivers door. PM me and include your email address and I will send you the schematic.