Abstract: This invention concerns a method of two-way communication between different nodes arranged at different positions in a vehicle, where information in the form of binary symbols is sent on at least two serial communication busses connecting said nodes. The nodes are separated into at least two groups where communication between nodes belonging to one group is more or less critical for driving the vehicle with respect to communication between the nodes in another group; and said different groups of nodes are connected to different communication busses where one end of each bus is connected to a gateway node. The invention also concerns a local area network and a motor vehicle including such an LAN.

Abstract: An arrangement for supplying heat to a motor vehicle when the vehicle engine is not running. At least one component is operated by electrical energy from a battery in the motor vehicle during the heat supplying to the vehicle and particularly for heating an interior space in the vehicle. An alarm which is activated when the voltage of the battery reaches a lowest acceptable level informs a drive to be able to prevent further lowering of the voltage level of the battery. The heat supply component may be a burner or may be the circulating engine coolant system and may include a fan.