Toyota 2012 Yaris Hatchback Owner's Manual page 347

6-2. Customization
Items to initialize
The following items must be initialized for normal system operation
after such cases as the battery being reconnected, or maintenance
being performed on the vehicle:
Item
Maintenance data
(except Canada)
Tire pressure warning
system (if equipped)
370
When to initialize
After the maintenance is per-
formed
When rotating the tires on vehi-
cles with differing front and rear
tire inflation pressures
Reference
P. 227
P. 254