Toyota 2016 Camry Owner's Manual page 422

422
7-3. Do-it-yourself maintenance
Vehicles with a smart key system

1
Take out the mechanical key.
2
Remove the cover.
To prevent damage to the key,
cover the tip of the screwdriver with
a rag.
3
Remove the depleted battery
using a small flathead screw-
driver.
Insert a new battery with the "+"
terminal facing up.
CAMRY_U (OM33C34U)