Rear Power Window Motor

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

Fig 1: Disconnecting Motor Connector From 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: Safety 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 Connector Terminals Continuity Chart
Courtesy of KIA MOTORS AMERICA, INC.