Kia Sedona: Battery replacement
A smart key battery should last for several years, but if the smart key is not working properly, try replacing the battery with a new one. If you are unsure how to use your smart key or replace the battery, contact an authorized Kia dealer.
1. Remove the mechanical key.
2. Pry open the rear cover.
3. Replace the battery with a new battery (CR2032). When replacing the battery, make sure the battery position.
4. Install the battery in the reverse order of removal.

Smart key precautions
Smart key immobilizer systemRecommended engine coolant
When adding coolant, use only deionized water or soft water for your vehicle
and never mix hard water in the coolant filled at the factory. An improper coolant
mixture can result in serious m ...
Battery Sensor Description and Operation
Description
Vehicles have many control units that use more electricity.
These units control their own system based on information from various
sensors. It is important to provide a stable power ...