Up until MK2 ( GE ) Honda did not use CANBUS, things are still individually wired, do not know about later models. In a CANBUS system every sensor and everything that needs switching is a 'node' and has an address that the master controller can speak to. It simplifies the wiring ( in the normal German way of simplifying stuff LOL ) as you now only need two power cables to each device, which also carry signals, but makes 'peripherals' expensive to replace because they now have to have electronic bits in them... The Japanese seem to work on 'evolution' rather than 'revolution' ( if it ain't broke - don't fix it ) - the canbus system can also measure the power being used by each device, and if a device like a bulb fails and the current drops it will signal a fault. The CANBUS friendly LED bulbs you see advertised are needed because an LED draws a fraction of the current that a filament bulb does and would signal a fault, the CANBUS LED has to have a resistor in parallel with the LED to make it draw more current to satisfy the CANBUS system that the bulb has not failed. My brother needed to replace the interior cabin light bulb on his Skoda, could not just replace the bulb, had to buy a new plug-in unit containing a bulb.