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This may sound stupid but people always talk about the dlc and obd connector. I know how to read a schematic but I don’t understand the fundmentals of the data link connector. I know there are 2 grounds and a power and i know the bus or can network is on that. My main issue is. How do I know if a module is communicating with another module. I know how to verify a power and ground and other things like pulse width and things like that. But can I use the dlc to see data communications from a module i suspect has an issue. I know to pull codes from the modules and find the other module it reports too. I guess my real question is how can i verify that a module is recieveing or not recieveing data and can the dlc help me to do that
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If you are having network communication issues you will U codes and a message about which module is not on line
For example U1170 lost communication drivers door switch ASM serial data.
Vehicles that use those systems often have diagnostic checks that can be done with a scan tool. Often it’s a higher end scan tool. If any of those systems are having an issue, they often set a code to let you know where to start looking.
I hope that helps.
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