TOYOTA 2010 Yaris - Manual (Page 351)

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5-2. Steps to take in an emergency
If the vehicle battery is discharged
The following procedures may be used to start the engine if the
vehicle's battery is discharged.
You can call your Toyota dealer or 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 Toyota following
the steps below.
Push the tab in and lift the
cover off.