ISO 14229-3:2012 specifies the implementation of a common set of unified diagnostic services (UDS) on controller area networks (CAN) in road vehicles (UDSonCAN).
It references ISO 14229-1 and ISO 14229-2 and specifies implementation requirements of the diagnostic services to be used for diagnostic communication over CAN.
It does not specify any requirement for the in-vehicle CAN bus architecture.