Vehicle-mounted switch system and diagnosis monitoring method

The invention provides a vehicle-mounted switch system and a diagnosis monitoring method. The vehicle-mounted switch system comprises a remote management unit, a register unit and a connection port, the connection port has a remote management mode and is used for transmitting a private message matched with the remote management mode; the register unit comprises a plurality of register subunits, the private message comprises mutually paired position information and instruction information, and the position information is in one-to-one correspondence with the register subunits; the remote management unit simultaneously sends corresponding instruction information to the corresponding register subunit based on the position information; and the register subunit completes corresponding operation based on the instruction information and feeds back the obtained feedback information to the external controller through the connection port. According to the configuration, the corresponding instruction information is sent