2000 Ford Taurus

The fuse must be ok ..for the window to operate down ... I would be checking the switch is working correctly ..

COMPONENT TESTS
MASTER WINDOW CONTROL SWITCH
Remove master window control switch from vehicle. Check continuity between specified terminals while operating switch to specified position. See MASTER WINDOW CONTROL SWITCH TESTING table. See Fig. 5 . Replace master window control switch if continuity between specified terminals is not as specified.
MASTER WINDOW CONTROL SWITCH TESTING
Switch Position....Between Terminals No.....Continuity
One-Touch Down
Down...........................4 & 8 (1) ...............Yes
Neutral..........................4 & 8 (1)............... No
Lock-Out Circuit
Locked..........................1 & 4....................Yes
Unlocked.......................1 & 4.....................No
Driver's Side
Up................................4 & 6 (1) ..............Yes
Down............................4 & 7 (1).............. Yes
Neutral....................2 & 6 (1) ; 2 &7 (1) ......Yes
Passenger's Side
Up................................4 & 4 (1) ...............Yes
Down............................3 & 4 (1) ................Yes
Neutral.................2 (1) & 4 (1) ; 2 (1) & 3 (1) Yes
Left Rear
Up.................................4 & 5.....................Yes
Down.............................4 & 6.....................Yes
Neutral...........................2 (1) & 5; 2 (1) & 6...Yes
Right Rear
Up..................................3 & 4...................Yes
Down..............................2 & 4....................Yes
Neutral.........................2 (1) & 3; 2 (1) & 2...Yes
(1)Location of terminal is found in C504a connector only.