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CAN is Controlled Area Network (i-bus is information bus, different terms for same thing, BMW uses the term "I Bus"). It's the system whereby different control modules share information on a single wire, instead of a bunch of different wires going between modules. Saves alot of weight. Don't think it has anything to do with your lights. Yes to do the system correctly there are level sensors to keep the lights aimed down the road. I think on a 202 it might have all been hardwired.
Gilly
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