There are different types of electric window mechanisms. Most commonly the use of a motor and a mechanism with a worm gear and a curved cogged arm are employed to create the up and down movement of the window glass. Another type uses a motor and a mechanism that has cables that are wound and unwound on spools to create the lift and drop of the window glass.
Problems with the cable type can be through lack of lubrication between the inner cable and the outer sleeve. This results in resistance and slowing of the mechanism and the speed of the movement in the window, or can be a complete seizure of the cable and a resulting snapping of the cable.
Replacement of the cable requires removal of the electric motor with its attached mechanism.
The motor and mechanism is located behind the the door card trim in the door cavity. Access to the motor and mechanism with the cables, requires the removal of the door card trim and the disconnection of the electrical connections.