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Dont know about headlights, never researched it.
As for the rest, the ECU will check each bulb for outages at startup, and then every 5 to 10 min as you're driving. The way it does this is by sending a quick pulse to each bulb to make sure there is no break in the circuit. An incandescent doesnt have time to light up, but an LED will flash. So canbus or not you will want to code your car not to send the bulb checks. For that reason canbus is a waste of money as the non-canbus is cheaper. But now you have to invest in coding.
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