Ford FUSION HYBRID 2015 Owner's Manual page 178

High Voltage Battery
Note: During this process, your vehicle will
detect if the electrical system is safe and
reactivate. Once your vehicle determines
the electrical system safe, you can start your
vehicle as you would normally by either
turning the ignition key or by pressing the
brake in combination with the
START/STOP button.
Note: In the event your vehicle does not
reactivate after the third key cycle, contact
an authorized dealer.
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Fusion/Mondeo (CC7), enUSA