Toyota PRIUS C 2019 Manual page 521

Vehicles without a smart key system:
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Maintain the engine speed of the second vehicle and start the
hybrid system of your vehicle by turning the power switch to the
"ON" position.
Vehicles with a smart key system:
Maintain the engine speed of the second vehicle and start the
hybrid system of your vehicle by turning the power switch to ON
mode.
Make sure the "READY" indicator comes on. If the indicator does
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not come on, contact your Toyota dealer.
Once the hybrid system has started, remove the jumper cables in
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the exact reverse order from which they were connected.
Close the exclusive jump starting terminal cover, and reinstall the
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fuse box cover to its original position.
When installing, first hook the fuse box cover onto the two rear tabs.
Once the hybrid system starts, have the vehicle inspected at your
Toyota dealer as soon as possible.
PRIUS c_U
8-2. Steps to take in an emergency
521
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