Toyota 2013 Prius Owner's Manual page 617

5-2. Steps to take in an emergency
If the 12-volt battery is discharged
The following procedures may be used to start the hybrid system if
the vehicle's 12-volt battery is discharged.
You can also call your Toyota dealer or a qualified repair shop.
If you have a set of jumper (or booster) cables and a second vehi-
cle with a 12-volt battery, you can jump start your vehicle by follow-
ing the steps below.
STEP 1
STEP 2
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PRIUS PHV_OM_OM47787U_(U)
Open the hood and fuse block
cover.
When closing, first hook the lid
onto the two rear tabs.
ITO43P127
Open the exclusive jump start-
ing terminal cover.