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Turn and lights control stalk     

Normally Turn and light control stalks have individual wires for each function controlling each circuit. However in case of what Honda/Acura had done is to bring everything into a microprocessor control board where each of the functions is then coded and transmitted over slow speed single wire CAN bus into MICU and relay control boards.
MICU is integrated into cabin fuse box where another microcontroller then decodes some of those signals and as example triggers turn flashers. Relay control board is part of engine bay fuse box and control things like lights and wipers.



.... more to come...