BMW I01 Product Information page 12

I01￿High-voltage￿Components
2.￿Important￿Notes
2.2.4.￿Verifying￿safe￿isolation￿from￿the￿supply
In￿BMW￿Service￿the￿de-energized￿state￿is￿not￿verified￿using￿a￿measuring￿device￿or￿via￿the￿diagnosis
system.￿Instead,￿the￿high-voltage￿components￿measure￿the￿voltage￿themselves￿and￿transmit￿the
measuring￿result￿via￿bus￿signal￿to￿the￿instrument￿cluster.
The￿instrument￿cluster￿does￿not￿generate￿the￿Check￿Control￿message￿to￿display￿the￿de-energized
state￿unless￿all￿involved￿high-voltage￿components￿consistently￿signal￿the￿de-energized￿state.￿This
Check￿Control￿symbol￿in￿red￿shows￿a￿crossed-out￿flash￿symbol.￿The￿text￿message￿"High-voltage
system￿switched￿off"￿also￿appears￿in￿the￿instrument￿cluster.
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By￿separating￿the￿high-voltage￿safety
connector,￿a￿bore￿hole￿becomes￿free￿through
both￿parts.￿The￿loop￿of￿a￿typical￿U-lock￿must￿be
inserted￿in￿this￿bore￿hole.
The￿U-lock￿can￿now￿be￿closed.￿The￿key￿must
be￿stored￿in￿a￿safe￿place￿during￿work￿on￿the
high-voltage￿system￿so￿that￿an￿unauthorized
person￿cannot￿unlock￿the￿lock.
The￿connector￿can￿no￿longer￿be￿used￿by
inserting￿and￿closing￿the￿U-lock￿at￿the￿high-
voltage￿safety￿connector.￿This￿is￿an￿effective
way￿of￿ensuring￿that￿the￿high-voltage￿system￿is
not￿switched￿on￿again￿without￿the￿knowledge
and￿consent￿of￿the￿Service￿employee.