Toyota 2015 Prius C Owner's Manual page 474

474
8-2. Steps to take in an emergency
Emergency start function (vehicles with a smart key system)
When the hybrid system does not start, the following steps can be
used as an interim measure to start the hybrid system if the "POWER"
switch is functioning normally.
Do not use this starting procedure except in case of emergency.
1
Set the parking brake.
2
Shift the shift lever to P.
3
Turn the "POWER" switch to ACCESSORY mode.
4
Press and hold the "POWER" switch for about 15 seconds.
Even if the hybrid system can be started using the above steps, the
system may be malfunctioning. Have the vehicle inspected by your
Toyota dealer.
I n f o r ma t i o n P r o v i d e d b y :