Toyota Prius Owner's Manual page 506

5-2. Steps to take in an emergency

Electric power steering system warning light (warning buzzer)
When the 12-volt battery charge becomes insufficient or the voltage tempo-
rarily drops, the electric power steering system warning light may come on
and the warning buzzer may sound.

If the malfunction indicator lamp comes on while driving
The malfunction indicator lamp will come on if the fuel tank becomes com-
pletely empty. If the fuel tank is empty, refuel the vehicle immediately. The
malfunction indicator lamp will go off after several trips.

When the tire pressure warning light comes on (vehicles with the tire
pressure warning system)
Check the tire inflation pressure and adjust to the appropriate level. Pushing
the tire pressure warning reset switch will not turn off the tire pressure warn-
ing light.

The tire pressure warning light may come on due to natural causes
(vehicles with the tire pressure warning system)
The tire pressure warning light may come on due to natural causes such as
natural air leaks and tire inflation pressure changes caused by temperature.
In this case, adjusting the tire inflation pressure will turn off the warning light
(after a few minutes).

When a tire is replaced with a spare tire (vehicles with the tire pressure
warning system)
Vehicles with a compact spare tire: The compact spare tire is not equipped
with a tire pressure warning valve and transmitter. If a tire goes flat, the tire
pressure warning light will not turn off even though the flat tire has been
replaced with the spare tire. Replace the spare tire with the repaired tire and
adjust the tire inflation pressure. The tire pressure warning light will go off
after a few minutes.
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