Rear Power Window Motor

Disconnect the negative (-) battery terminal.
Remove the rear door trim.
(Refer to Body - "REAR DOOR TRIM ")
Disconnect the connector (A) from the motor.

Fig 1: Locate Rear Power Window Motor Connector Terminals
Courtesy of KIA MOTORS AMERICA, INC.
Connect the motor terminals directly to battery voltage (12V) and check that the motor operates smoothly. Next, reverse the polarity and check that the motor operates smoothly in the reverse direction. If the operation is abnormal, replace the motor.

Fig 2: Rear Power Window Motor Terminal Description Chart
Courtesy of KIA MOTORS AMERICA, INC.