Fail-Safe Functions
WARNING: This page is about a different car, the 1998 Honda Prelude. However, it is still accessible from the selected car via links, so may be relevant.
To prevent improper operation, the multiplex system has a fail-safe function. In fail-safe mode, output signals will use default values until fault is corrected (i.e. faulty control unit or communication line). Each multiplex control unit has hardware fail-safe output signal defaults when there is a CPU failure. There are also software fail-safe defaults that ignore faulty multiplex control unit signals and allows system to continue to function.