ISO 14229-7:2022

Overview

ISO 14229-7:2022 - "Road vehicles - Unified diagnostic services (UDS) - Part 7: UDS on Local Interconnect Network (UDSonLIN)" defines an application profile for implementing UDS on LIN in road vehicles. It references ISO 14229‑1 and ISO 14229‑2 and specifies the implementation requirements, additional requirements and specific restrictions for diagnostic communication over the Local Interconnect Network (LIN). The standard maps UDS functionality onto the OSI model layers and adapts UDS service primitives and PDUs for LIN-based networks.

Key Topics and Requirements

• Application layer mapping: Definitions for UDS service primitives (e.g., A_Data.req, A_Data.ind, A_Data.conf) and the A_PDU / A_Length concepts tailored for LIN.
• Transport and network adaptation: Mapping of UDS transport primitives (T_Data) and PDUs (T_PDU, N_PDU) to LIN transport and network layer mechanisms.
• Data link and physical layer considerations: LIN-specific L_PDU formats, L_PID, and L_CS definitions; interactions with LIN physical layer requirements.
• Session & presentation layer alignment: Service primitive parameter definitions consistent with ISO 14229‑2 and ISO 14229‑1 to ensure interoperable session management and message presentation.
• Timing parameters: Definitions and requirements for UDS timing values when operating over LIN (e.g., P2/P2* time axes for LIN commander/responder).
• Node roles and requirements: Specific LIN commander and LIN responder requirements, including addressing (NAD), use of functional addressing, and receive buffer sizing.
• Service-specific implementations: UDSonLIN requirements and restrictions for services such as CommunicationControl (activation/de-activation of message types) and ResponseOnEvent (ResponseHeader and behavior).
• Signal-based diagnostics: Guidelines for implementing signal-oriented diagnostics on LIN and integration with tool suites for diagnostic testing.

Applications - Who Uses This Standard

• Automotive OEMs and Tier‑1 suppliers implementing diagnostics over LIN for body electronics, seat controls, climate control and other subsystems.
• ECU and LIN node manufacturers ensuring compliance with UDSonLIN node/commander requirements.
• Diagnostic tool and test-suite vendors adapting diagnostic testers and software to UDSonLIN service primitives, PDUs and timing constraints.
• System integrators and software engineers mapping higher-level UDS services to LIN transport/network and validating timing/functional behavior.

Related Standards

• ISO 14229‑1 - UDS Application layer
• ISO 14229‑2 - UDS Session layer services
• ISO 17987‑2 / ‑3 / ‑4 - LIN transport/network, protocol specification, and electrical/physical layer

This standard is essential for practitioners implementing reliable, standardized diagnostic communication over LIN and for ensuring interoperability across vehicle diagnostic toolchains.