Yeah, it appears they changed it at some point. Maybe in 96 when they did the alternator upgrade and changed a number of things under the left sidepanel?
all can bus is, a communication line that allows all the modules to talk to each other and a scanner. Module will store fault codes and you need a way to read them. An auto has and uses many different types on communication lines and have since computers were first used. An ST1100 with abs trac control has a hi speed com line ( don't know which one) Once you understand how it works it's not all that difficult. And yes Tom is correct most can lines are about 2.5-5 volts.
If I had a bike like a New BMW with all their computer controlled modules and fancy doo dads I sure would not want to find out what a short would do or not.A completely Luddite misunderstanding of modern Canbus systems. CAN transceivers are short circuit protected by design. An accidental short will result in no damage or "expensive" repairs. At most a simple clearing of fault codes once the short is removed is required.
From Google:
"Signals are extremely low current signals and, by design, no damage will occur if either CAN High or Low are shorted to each other, B+ or ground. I have seen many shorted CAN signals caused from rodent damaged wires or faulty control modules and no damage was created by the short. Note that power-train CAN buses can not operate on "single wire mode". If either CAN high or low is shorted the communication will stop on the entire bus. Usually body related CAN buses can operate in single wire mode. If you do accidentally short either CAN signal you are likely to induce fault entries into the vehicle control modules that will need to be cleared after the wiring is repaired."
Tom
I'd expect a Luddite to prefer smoke to be their electrical short warning.If I had a bike like a New BMW with all their computer controlled modules and fancy doo dads I sure would not want to find out what a short would do or not.
Actually I have quite a bit of training in electronic's and just to let you know a electronic board can be rendered useless by only a half a volt or less on the wrong terminal. It doesn't take much so you don't need to see smoke....but I guess you knew that. Also had static electricity blow one before. Seen it happened to another technician at my shop. These newer chips can't take it like the older ones.I'd expect a Luddite to prefer smoke to be their electrical short warning.
Tom
yea you can melt a foil circuit with a 1/2 volt but why can drivers (in a computer not talking about Russ) still work after being shorted......... you can screw up anything if you know the right way to do it
Before I retired when the boards went bad on copier machines yep the hard drives were ok. Most calls were after a storm and when power came back on boom a power surge caused the power supply board to go. Also had people stick paper clips into copier machine paper feed and pick rollers trying to get paper jam out. Clip accidently falls into machine and shorts out low voltage power supply board. But yeah driver is ok. I think its like motor and clutches and solenoids do not get affected like electronic chips. These things were so delicate that you handled them with a glove and grounding clip to avoid any static electricity.
I was referring to not hard drives but the drivers that control solenoids, motors, injectors. In auto those wires can get shorted to ground, shorted to voltage and the computer does not fail it shuts down that circuit. auto/bike computer controlled systems are fairly durable but not bullet proof.
Same thing with a copier machine. For instance say as a tech I get a call for a machine that won't feed paper. Now if its electronically related I get a fault code. This code will tell me my paper feed motor or clutch is not rotating or engaging. So I pull out my trouble shooting book or lap top software and plug it into copier machine. My trouble shooting would look like this a visual inspection and then ohming out the clutch, motor and wire harness. If thats all good I would put the machine in diagonostic mode to see if the 24 dc operating voltage to get the motor/clutch to operate is present. If my 24 volts is not present then I'm looking at a driver chip on my low voltage power supply board. I either unsoldered it and replace it or if its one of those etched circuit boards it get replaced.
Check your fuses for those circuits also.
