I had lunch with my wife's mechanic cousin and a friend of his who works at the largest GM dealer in central Kentucky.
GM uses CAN, LIN and have their own proprietary GMLAN.
GMLAN is most often used for door/seatbelt chimes, oil change, is the seat occupied, seat heating and position, radio to CD changer, radio to AF power amplifier, Radio to motorized antenna, cell phone to radio (mute).
Most radios that use GMLAN must have the other expected connections or it won't power up.
Each GMLAN can be a stand alone, isolated network, or linked through bridges.?
CAN is used in machine shops, maritime and aviation, some home automation is moving that way.
Some 3D printers use CAN commands.
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The CAN readers are less then $100 on Amazon, and, if you have the training and car diagram, can do a decent though not perfect job troubleshooting CAN.
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In many (most) cars/trucks the CAN diagnostic is also the OBDII connector. The car can tell bu the connected test equipment if it's requesting OBDII or CAN data.
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High end cars typically lock out access to all sorts of CAN diagnostic data and won't allow resetting unless you have the factory software.
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I checked for the Volvo when we got the car, 10 years ago, the I/O connector level shifter coast over $500 and the software was over $1k. The software was available at many places online but I decided it'd be simpler to bypass the CAN BS and use relays for local control.
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Apparently the 2006 "you must use CAN" only applies if you as a company or individual make more then X number of cars/trucks a year.
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The GM mechanic races dirt bikes and told me how BMW Motorarad Single Wire System is edging out CAN for bikes.
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Sure glad my Honda CB-360 is dumb as a rock, not that I can ride it, the orthopedist specifically forbad riding any motorcycle and especially any of the Honda Twins because of the vibration.
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I also own a 1981 Subaru 4WD station wagon. Need to complete transfer then rewire the charge system, someone jumped it from a +24V positive ground coal truck.
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Dumb as a rock is sounding better and better for cars and trucks.
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