Trunk lid open switch

Disconnect the negative (-) battery terminal.
Remove the trunk door trim.
(Refer to "TRUNK TRIM ")
Disconnect the trunk lid open switch connector (A).

Fig 1: Locating Trunk Lid Open Switch Connector
Courtesy of KIA MOTORS AMERICA, INC.
Remove the trunk open switch (A) from the trunk garnish.

Fig 2: Locating Trunk Open Switch With Mounting Nuts

Courtesy of KIA MOTORS AMERICA, INC.