BMS CANBus Loopback

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BMS CANBus loopback is a function of the built-in cable communications support for the Power Tank or the second Power Pack Module in a non-longbrick X platform model (labeled BMS1 by the MBB).

The cabling ends in a multi-pin connector and should either:

  1. Terminate with a Loopback Blanking Plug that wires two pins together in a loopback circuit.
  2. Connect to a Power Tank's corresponding communications cable.

If one of the above conditions do not hold, the MBB is configured to issue error code 35.

It is unconfirmed what purpose the loopback mechanism serves.
Hypothesis: This is a hardware debugging mechanism for a loose connector.