ISO 11992-2-2023 PDF

Full title and description

Road vehicles — Interchange of digital information on electrical connections between towing and towed vehicles — Part 2: Application layer for brakes and running gear. This edition specifies the SAE J1939‑based application layer, message payloads and parameter groups needed for electronically controlled braking systems (including ABS and vehicle dynamics control) and running‑gear equipment to enable digital interchange between tractors and towed vehicles (vehicles > 3 500 kg).

Abstract

The document defines the application‑layer structure, payload formats and parameter groups used for braking and running gear communication over the ISO 11992 towing/towed vehicle interface. It focuses on interoperability of braking and running‑gear ECUs between towing and towed vehicles; conformance and interoperability test plans are not included in the standard.

General information

• Status: Published
• Publication date: 10 March 2023
• Publisher: International Organization for Standardization (ISO)
• ICS / categories: 43.040.15 (Car informatics / On‑board computer systems)
• Edition / version: Edition 4 (2023)
• Number of pages: 103

These bibliographic and lifecycle details are taken from the ISO record for ISO 11992‑2:2023.

Scope

Specifies the SAE J1939‑based application layer for exchanging digital information on electrical connections between towing and towed road vehicles with a maximum authorized total mass greater than 3 500 kg. The standard covers message payload definitions and parameter groups required by electronically controlled braking systems (ABS, VDC) and running‑gear equipment and supports communication between multiple towed vehicles. Diagnostic and conformance testing procedures are not part of this part (diagnostic communication is addressed separately in Part 4).

Key topics and requirements

• SAE J1939‑based application‑layer definition mapped to the ISO 11992 towing/towed interface.
• Message payload formats and parameter group definitions for electronically controlled braking systems (ABS, VDC) and running‑gear devices.
• Parameter Group Numbers (PGNs) and data field (SPN) allocations to ensure interoperable ECUs between tractor and trailer.
• Timing and transmission behavior required for brake and running‑gear signals over the towing connection.
• Interoperability guidance for communication between multiple towed vehicles (trailer‑to‑trailer messaging considerations).
• Exclusion: conformance and interoperability test plans are not specified in this document (see related diagnostic/validation parts).

Typical use and users

Primary users include heavy‑vehicle OEMs, trailer and braking system manufacturers, ECU and telematics developers, system integrators, fleet engineering teams, test laboratories and compliance/standards engineers. The standard is used to design and implement trailer/tractor communication for braking and running‑gear systems and to ensure cross‑vendor interoperability on the towing electrical interface.

Related standards

ISO 11992 is a multi‑part series; related and companion documents include: ISO 11992‑1:2019 — Part 1: Physical and data‑link layers (defines PHY and DLL for the towing/towed CAN interfaces). ISO 11992‑3:2021 — Part 3: Application layer for equipment other than brakes and running gear (lighting, object detection, other trailer equipment). ISO 11992‑4:2023 — Part 4: Diagnostic communication (diagnostic application/profile for towing/towed networks). Note: ISO has a committee draft (ISO/CD 11992‑2) in development as the next revision of Part 2.

Keywords

ISO 11992, trailer communication, tractor‑trailer interface, SAE J1939, application layer, ABS, VDC, running gear, parameter groups, PGN, SPN, heavy vehicles, towing electrical connection

FAQ

Q: What is this standard?

A: ISO 11992‑2:2023 is the fourth‑edition international standard that defines the SAE J1939‑based application layer, message payloads and parameter groups for braking and running‑gear communications between towing and towed vehicles.

Q: What does it cover?

A: It covers application‑layer message formats and parameter definitions used by electronically controlled braking systems (including ABS and VDC) and running‑gear equipment to enable interoperability between tractors and trailers (vehicles > 3 500 kg). It does not include conformance test plans.

Q: Who typically uses it?

A: Heavy‑vehicle OEM engineers, trailer and braking system manufacturers, ECU developers, system integrators, test labs and fleet technical staff use this standard when developing or integrating braking/running‑gear communication over the towing interface.

Q: Is it current or superseded?

A: ISO 11992‑2:2023 is the current published edition (published 10 March 2023). The ISO record indicates the standard is scheduled for periodic review and an ISO committee draft (ISO/CD 11992‑2) is under development as the next revision.

Q: Is it part of a series?

A: Yes — it is Part 2 of the ISO 11992 series. Companion parts include Part 1 (physical/data‑link), Part 3 (application for non‑brake equipment) and Part 4 (diagnostic communication).

Q: What are the key keywords?

A: SAE J1939, application layer, ISO 11992, trailer communication, ABS, VDC, running gear, PGN, SPN, tractor‑trailer interface.