The following features have been incorporated into Focus electric vehicles to allow for
either simple or automatic shut-off of the high-voltage electrical systems.
• High-voltage fuse — In the event of a high-voltage short circuit, the
high-voltage fuse opens, isolating the high-voltage system.
• High-voltage interlock circuit — Whenever a high-voltage connector
is disconnected, the high-voltage interlock circuit opens and isolates
the high-voltage system. The circuit will also open if a high-voltage cable is
cut, broken, or severed. This circuit is wrapped around high-voltage cables.
• Ignition is in the OFF position when the vehicle ready light is off. Any time
the ready light is off, the high-voltage system is isolated. If the vehicle
ready light is on, press the start button to turn off the ignition.
• Battery high-voltage service disconnect — Whenever either of the battery
high-voltage service disconnects are removed, the high-voltage system is
isolated. For additional information, refer to High Voltage Service Disconnect
in this manual.
• Thermal sensors — If the battery is exposed to hot ambient conditions
and/or is being driven aggressively with compromised cooling, power
limits will be employed to prevent overheating. However, if the battery is in
use and becomes too hot, contacts will open and the vehicle will
shut down.