Toyota Yaris Owner's Manual page 105

If the indicator or buzzer comes on...
(g)
(h)
(i)
(j)
(k)
(l)
(m) Light reminder buzzer
98
Fill up tank.
Stop and check.
Take vehicle to Toyota dealer. If brake system warning light is also on, stop
immediately and contact Toyota dealer.
Take vehicle to Toyota dealer immediately.
Take vehicle to Toyota dealer.
Close all side doors and back door.
Turn off lights.
Do this.