Taurus 93: power door and seat stopped working the same time

Hi, everybody:
I wonder who can help me solve this problem. I have a 93 Taurus sedan, LX. The power door and seat stopped working. There is a circuit breaker
on the fuse panel that controls the power door, seat, and window. As the power window works fine, I guess the problem is within the common circuit area for the power door and seat. But I don't know where it's located and how to get there. I would appreciate if anybody can give me some advice. Thanks!
Sincerely,
Joe
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