CaBus low voltage should be 2.2 -2.5 volts. CanBus high voltage should be 2.7 -2.5. Another thing to check is static straps. I don't think it would be the display because it's talking. If your ID1 pin in the TPA plug isn't seated properly it can confuse the system not letting it know which node it is. I would recommend having the Raymond dealer hook up to it. You will need them to program what ever component you end up replacing.
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.