PURPOSE: To obtain a multiplex communication system for vehicle which is capable of detecting a fail by a self side node even when other communication node fails and runs away, in a multiplex communication system for vehicle to which plural communication nodes are connected.
CONSTITUTION: In a multiplex communication system for vehicle, a first multiplex communication node 300 controlling the window motor 30 on the side of a driver's seat and second multiplex communication nodes 400, 401 and 402 controlling the window motors 415 of other seats are connected on a common communication line 310. The multiplex communication node 300 periodically outputs a pre-monitoring signal 'clear' to multiplex communication nodes 400, 401 and 402. The multiplex communication nodes 400, 401 and 402 receive this monitoring signal 'clear' and monitor the receiving interval.
HIRANO SEIJI
TERAYAMA KOJI
NAKAZONO HIDEMI
