Rear Power Window Motor

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

Fig 1: Disconnecting Connector From Rear Power Window Motor
Courtesy of KIA MOTORS AMERICA, INC.
Connect the terminals No. 1 and No. 2 to battery voltage (12V) and check that the motor operates smoothly when connected to the following terminals:
[Safety window motor]

Fig 2: Rear Power Window Motor Connector Terminals Continuity Chart
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.
[Standard Window Motor]

Fig 3: Standard Window Motor Continuity Chart
Courtesy of KIA MOTORS AMERICA, INC.