Toyota FORTUNER 2021 Owner's Manual page 398

396
6-3. Do-it-yourself maintenance
Remove the depleted battery.
3
Insert a new battery with the "+"
terminal facing up.
Vehicles with smart entry & start system

Take out the mechanical key.
1
Remove the cover.
2
To prevent damage to the key,
cover the tip of the screwdriver with
a rag.
Remove the depleted battery.
3
Insert a new battery with the "+"
terminal facing up.