The CAN-L and CAN-H on the Volkswagen 34D035185A terminals are part of the body network transmission mode.
CAN-L refers to the low voltage in the dominant state, usually 0V; CAN-H refers to the high voltage of the network cable in the dominant state, usually 3.5V. These two wires are the high data line and the low data line, twisted together to make the CAN bus insensitive to electromagnetic interference.
In Volkswagen, CAN-L and CAN-H are communication lines used to connect the various electrical components and equipment of the car, and they are an important part of the electrical system of the car.