Need help with diagnosis of high and low speed CAN bus issues...willing to pay qualified person

Hi, I had been having exactly the same issues as you and also using an Autel scanner could not communicate, though my thinktool scanner could but just gave "canbus" fault error codes in many systems. I finally traced the problem to the parking distance control unit in the rear being water contaminated, also the amplifier for the radio etc was the same, swapped out both units for good used off ebay and have had no canbus or other issues come back so far but no doubt now saying that next start she will treat me too some lol. My advice is rather than getting bogged down in deciphering canbus operation check the modules for water contamination first, its easiest way forward and these two units are notoriously at risk for water intrusion on L322, also check behind both front kick panels as the ecu's there can be at risk also. Hope this helps, any corrosion will bring the canbus down on these L322's in the weirdest ways that you cannot imagine.