My power seat on the driver side won't work but I know the motor is good .

Hello, You'll want to consult the owners manual for the fuse location, but the switch may be bad. You can test it by checking for continuity while pressed. Also, you can see if there is power getting to the switch when the key is turned to the "ON" position. If no power and fuse is good, check if there is power at the fuse and find where power stops traveling to the seat.