Tailgate Open Switch

Remove the tailgate trim.
(Refer to Body - "TAILGATE TRIM ")
Disconnect the connector from the actuator.

Fig 1: Tailgate Open Switch Connector Terminals
Courtesy of KIA MOTORS AMERICA, INC.
Check for continuity between the terminals in each switch position according to the table.

Fig 2: Tailgate Open Switch Terminal Continuity Chart
Courtesy of KIA MOTORS AMERICA, INC.