Discussion
Which procedure isolates the traction battery for service?
Answer: D
The manual service disconnect physically breaks the pack, and a waiting period lets the capacitors discharge before the absence of voltage is verified. Disconnecting the twelve volt supply does open the contactors, which makes the second option a real part of the procedure. The order in which the effects act is what decides the outcome, so it is worth establishing first. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.
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