ISO 15031-3:2023

Overview

ISO 15031-3:2023 establishes the requirements for the diagnostic connector and related electrical circuits used in road vehicles for emissions-related diagnostics. This international standard is a key document that ensures uniform communication between a vehicle's on-board diagnostic (OBD) system and external test equipment. It references the latest edition of SAE J1962 and addresses both left-hand and right-hand driven (RHD) vehicles, adding additional requirements for the latter.

Standardization of the diagnostic connector is crucial for regulatory compliance, vehicle maintenance, and the automotive aftermarket. It facilitates effective access to vehicle diagnostic data, particularly for emissions control and regulatory inspections.

Key Topics

• Diagnostic Connector Requirements
  Defines the physical connection and pin usage for standardized access to OBD information.
• Right-Hand Driven (RHD) Vehicle Adaptations
  Specifies additional placement and mounting requirements tailored to RHD vehicles for consistent diagnostic accessibility.
• Pin-Out for Ethernet and Communication Lines
  Includes provisions for Ethernet support layouts and additional communication lines, such as those required for on-board pyrotechnic devices.
• Referencing SAE J1962
  Maintains technical equivalence with SAE J1962, with clear identification of any exceptions or additional requirements, ensuring international harmonization.
• OSI Model Alignment
  Integrates with the Open Systems Interconnection (OSI) Basic Reference Model, ensuring compatibility and interoperability across various communication protocols and test equipment.

Applications

ISO 15031-3:2023 serves multiple practical purposes in the automotive sector:

• Regulatory Compliance
  Meets legal requirements for standardized OBD access, vital for emissions testing, certification, and inspection procedures.
• Vehicle Diagnostics and Service
  Enables repair shops and service centers to perform efficient emissions-related diagnostics and troubleshooting using universally compatible equipment.
• Aftermarket Tools Compatibility
  Supports the development of industry-accepted diagnostic tools, allowing third-party devices to interface reliably with the vehicle's OBD system.
• Global Vehicle Manufacturing
  Assists manufacturers in designing and producing vehicles that meet international standards for OBD connectors, including specific provisions for both LHD and RHD markets.
• Safety Systems Integration
  Includes specifications for additional communication lines such as those for pyrotechnic devices, supporting modern vehicle safety features.

Related Standards

For complete implementation and context, the following standards are referenced or related:

• SAE J1962 - Diagnostic Connector (foundational specification referenced throughout ISO 15031-3)
• ISO 13400-4 - Diagnostic communication over Internet Protocol (DoIP) - Ethernet-based high-speed data link connector
• ISO 15031-2 - Guidance on terms, definitions, abbreviations and acronyms for road vehicle diagnostics
• ISO 26021-1 - Activation of in-vehicle pyrotechnic devices - Application and communication interface
• ISO 9141-2, ISO 14230-4 - Emissions-related communication protocols
• ISO 11898-1, ISO 11898-2 - Controller Area Network (CAN) interface
• SAE J1850 - Data Communications Network Interface

By adhering to ISO 15031-3:2023, automotive manufacturers, repair facilities, and tool providers ensure interoperability, regulatory compliance, and the highest standards in vehicle diagnostics for emissions-related systems.