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I understand it is Body Systems Interface.  In Peugeot/Citroen multiplexed vehicles, it handles everything except the engine, gearbox and folding roof, which have their own ECUs.  The PSA implementation is very sensitive to loss of electrical supply whilst it "awake" which can corrupt the software, necessitating a reboot which presumably reloads the software from non-volatile memory.  It can be a bit of a song-and-dance, because opening a door on a newly rebooted system can cause re-corruption.  The work-around is to lower the driver's window before rebooting, and, after rebooting, switch the sidelights on before opening the door, but this is allegedly not necessary on newer models.

For the full story see here.

I have not heard of this issue with other manufacturers, hence my question.

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