Kia Sedona: Battery replacement
The transmitter uses a 3 volt lithium battery which will normally last for several years. When replacement is necessary, use the following procedure.
1. Insert a slim tool into the slot and gently pry open the transmitter center cover.
2. Replace the battery with a new battery (CR2032). When replacing the battery, make sure the battery is positioned battery.
3. Install the battery in the reverse order of removal.
For replacement transmitters, see an authorized Kia dealer for transmitter reprogramming.

Transmitter precautions
Immobilizer systemLimitations of the system
The SCC may have limits to its ability to detect distance to the vehicle ahead
due to road and traffic conditions. ...