Toyota 2016 Prius Service Manual page 712

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8-2. Steps to take in an emergency
Connect the jumper cables according to the following procedure:
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Connect a positive jumper cable clamp to the positive (+) battery
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terminal on your vehicle.
Connect the clamp on the other end of the positive cable to the
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positive (+) battery terminal on the second vehicle.
Connect a negative cable clamp to the negative (-) battery termi-
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nal on the second vehicle.
Connect the clamp at the other end of the negative cable to a
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solid, stationary, unpainted metallic point away from the 12-volt
battery and any moving parts, as shown in the illustration.
Start the engine of the second vehicle. Increase the engine speed
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slightly and maintain at that level for approximately 5 minutes to
recharge the 12-volt battery of your vehicle.
Maintain the engine speed of the second vehicle and start the
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hybrid system of your vehicle by turning the power switch to ON
mode.
Make sure the "READY" indicator comes on. If the indicator light
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does not come on, contact your Toyota dealer.
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