ISO 18541-3:2021

Overview

ISO 18541-3:2021 - "Road vehicles - Standardized access to automotive repair and maintenance information (RMI) - Part 3: Functional user interface requirements" defines functional user-interface (UI) requirements for vehicle manufacturers’ RMI systems. The standard aims to standardize how independent operators (IOs) access repair and maintenance information so that navigation, entry points and support elements are consistent across vehicle manufacturer (VM) websites. ISO 18541-3:2021 is the second edition and aligns with the use cases in ISO 18541-1.

Key topics and technical requirements

• Standardized navigation entry point: VM RMI home pages must include a link or button (labelled e.g., “Standardized navigation”) that launches the ISO 18541-3 access mode in addition to any VM-specific navigation.
• Registration and login support: VM RMI systems shall support user registration and login workflows; the use cases map may be shown before or after login depending on VM policy.
• Use cases map and download area: The standard requires a “use cases map” (as defined in ISO 18541-1) to show which standardized use cases the VM implements and to provide access to a download area for relevant artefacts.
• Navigational pathway: Defines how the standardized use-case-driven pathway guides an IO from the common use-case map to VM-specific entry points and RMI support artefacts that explain the VM’s internal navigation.
• Requirements clusters and principles: Requirements are grouped into clusters (standardized access mode, use cases map, navigational pathway). Core principles require performance-focused, implementation-agnostic requirements that allow flexible navigational pathways and minimize impact to existing VM RMI systems (BP1–BP4).
• Conventions and references: The document uses OSI service conventions (ISO/IEC 10731) and references ISO 18541-1 for terms and use-case definitions.

Applications and who uses it

• Independent repairers and workshops (IOs) benefit from predictable access and consistent UI behavior across multiple VM RMI sites.
• Vehicle manufacturers (VMs) use the standard to implement accessible, compliant RMI portals that meet legislative and marketplace expectations.
• OEM IT teams, aftermarket software vendors, and RMI platform providers use the requirements to design navigation, login, and support artefacts that map standardized use cases to VM-specific systems.
• Regulators and policymakers can reference ISO 18541-3 when specifying access requirements for RMI in law or mandates (e.g., EC Mandate M/421).

Related standards

• ISO 18541-1:2021 - General information and use-case definition (required reference for use-case semantics)
• ISO/IEC 10731 - OSI service conventions (conventions used in the document)

Keywords: ISO 18541-3, RMI, repair and maintenance information, standardized navigation, user interface requirements, vehicle manufacturer RMI, independent operators, use cases map, navigational pathway.