October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

Possible fault causes

The power supply for the designated control unit is not present or is present only to a limited extent.
The CAN line CAN-High and/or CAN-Low is interrupted between the control unit connector of the designated control unit and the first splice behind the control unit.
Control unit faulty