A hello to the smart heads here. My TGA 18-430, D20 can no longer be decoupled from the ignition voltage (terminal 15). Engine stops after closing but everything else, e.g. instrument panel etc. continue to shine, even if keys are deducted. Parallel error messages from FFR & RET S as well as the message EDC come. Engine can be started at any time, runs perfectly and in driving mode without fault messages. Ignition lock has already been controlled, plug-in relay under dashboard passenger side and plugged out but without result. Does anyone know this phenomenon and / or knows advice? Thank you in advance