In article , Harry Bloomfield
wrote:
Michael Chare formulated the question :
I presume cars are made a economically as possible, so is it really the
case that a rear light unit with LEDs and driven by CAN bus, with two
thin wires for the power and two even thinner wires for CAN-H and
CAN-L bus is really cheaper to make than one with convention bulbs and
much thicker wires?

The modern system does not make connecting a trailer light socket easy!

Actually, it makes it easier and it can be more clever. One thick wire
as the main supply, then thin wires can be used to pick up the signals.
The trailer lights can be monitored and issues fed as data down the
can-bus.


what's so new about this? I was at an international exhibition in Hamburg
in the '70s. There was a Leyland bus that was wired in this way. 40 years
ago!

--
from KT24 in Surrey, England