BMW I01 Product Information page 177

I01￿High-voltage￿Components
12.￿Technical￿Safety￿Precautions
12.1.￿High￿voltage￿interlock￿loop
The￿high-voltage￿interlock￿loop￿is￿used￿to￿protect￿individuals￿when￿working￿on￿or￿at￿the￿high-voltage
components.￿Via￿the￿high-voltage￿interlock￿loop￿it￿is￿identified￿whether￿one￿or￿several￿high-voltage
plug￿connections￿have￿been￿disconnected.￿If￿a￿high-voltage￿plug￿connection￿has￿been￿disconnected,
the￿entire￿high-voltage￿system￿is￿shut￿down￿automatically.￿A￿square￿wave￿signal￿with￿alternating
current￿direction￿is￿sent￿through￿the￿line￿of￿the￿high-voltage￿interlock￿loop￿by￿the￿battery￿management
electronics￿SME.￿The￿SME￿and￿the￿electrical￿machine￿electronics￿EME￿evaluate￿this￿signal.
The￿line￿of￿the￿high-voltage￿interlock￿loop￿runs￿through￿each￿connector/plug￿of￿the￿high-voltage
components,￿which￿are￿able￿to￿generate￿high￿voltage.
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