- Edited
Same model CANbus adapter in my Meriva B. I had an issue where the 8 pin CANbus plug had not clipped into the socket of the Dudu7 (completely my fault) and it worked it's way loose during installation. The display would intermittently show the doors open and the fan controls being used but volume control and the SWC buttons were unreliable. After fixing the connector securely it all works well.
TL : DR: Check: Settings->About->Model name. If the text string ends Unknown CANbus version double check the 8 pin CANbus plug.