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Thanks Marc_986, that's very helpful. From what you're saying, I have a problem with both CAN-systems, which in my opinion would rule out the CAN-data wiring having a break somewhere being an issue.
That leaves me with the instrument cluster being faulty (seeming more likely now), or an issue with the CAN-power supply wiring, if such a thing exists.
I don't believe I clarified, I have no noticable issues with my instrument cluster. Whatever the problem is, I believe it is isolated to the CAN-computer.
By any chance, does someone know the pinout of the connectors on the instrument cluster, and which spots the CAN-related pins are? I think my next step should be to check for voltage at the power supply pins. If that check passes, replace the instrument cluster, and if not, repair the wiring.
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