BS EN 50436-4-2022 PDF

Full title and description

BS EN 50436-4:2022 — Alcohol interlocks. Test methods and performance requirements — Part 4: Connection and digital interface between the alcohol interlock and the vehicle. The document specifies the electrical connection, connector properties, pin assignments and the digital communication (LIN and CAN/J1939) required for safe, testable integration of alcohol interlocks into vehicles, covering both production and aftermarket installations for offender‑program and preventive use.

Abstract

This part of the EN 50436 series defines a standardised vehicle–interlock interface: physical connector requirements and the digital message sets, states and protocols used to exchange status, activation/deactivation and diagnostic data between vehicle and alcohol interlock. It includes power management rules, communication state machines, signal coding and validation, conformance tests for LIN and CAN (J1939), and informative annexes (example LDF/DBC files, hazard analysis aligned with ISO 26262 and conformance/test plans).

General information

• Status: Published / Current standard (EN edition adopted as national standards including BS).
• Publication date: August 2022 (EN edition issued July–August 2022; national adoptions recorded in July–August 2022).
• Publisher: CENELEC (European Committee for Electrotechnical Standardization) — published as EN 50436-4:2022 and adopted by national bodies (e.g., BSI for BS EN 50436-4:2022).
• ICS / categories: 43.040.10 (Electrical and electronic equipment); 71.040.40 (Chemical analysis / breath‑alcohol testing).
• Edition / version: 2022 edition (supersedes EN 50436-4:2019).
• Number of pages: approx. 113–116 pages (published national PDFs and catalogs list 113–116 pages depending on cover/annex formatting).

Scope

Specifies the electrical and digital interface between road vehicles and alcohol interlocks, applicable to devices for drink‑driving‑offender programmes and for general preventive installations. The standard covers connector and wiring requirements, pin assignments and labelling, options for power continuity or switch‑off, activation/deactivation behavior (including shutdown requests), and the digital protocol, message frames and state transitions for LIN and CAN/J1939 implementations. It also defines test and conformance requirements and informative annexes with example description files and hazard analysis guidance.

Key topics and requirements

• Standardised connector properties, pin assignments and installation documentation requirements for safe vehicle integration.
• Digital communication support: LIN (vehicle as LIN master, interlock as slave) and CAN (J1939) — message sets, identifiers, signal coding and example LDF/DBC files.
• Defined communication states and state transitions for vehicle and interlock, including activation, deactivation and shutdown handling.
• Power management rules: options to maintain power to the interlock or switch off the supply, and behaviour after shutdown requests.
• Signal validation, error handling, and conformance test requirements (LIN and CAN conformance testing and suggested test plans).
• System safety analysis and informative annex for Hazard Analysis and Risk Assessment (references ISO 26262); guidance on documentation and testability.

Typical use and users

Primary users include alcohol‑interlock manufacturers, vehicle OEMs and Tier‑1 integrators, testing and certification laboratories, road‑safety authorities and organisations running drink‑driving‑offender programmes, and professional installers of aftermarket interlocks. The standard is used to design compliant interlock hardware and vehicle interfaces, prepare installation documentation and run type/conformance tests.

Related standards

Part of the EN 50436 series (see EN 50436‑1, EN 50436‑2, EN 50436‑3, EN 50436‑7 for device requirements, preventive use and installation guidance). Cross‑references and related safety/cybersecurity standards include ISO 26262 (functional safety) and ISO/SAE 21434 (road vehicle cybersecurity) as relevant guidance for hazard analysis and secure data exchange.

Keywords

Alcohol interlock; alcohol ignition interlock; vehicle interface; LIN; CAN J1939; connector; pin assignment; communications protocol; test methods; conformance testing; ISO 26262; installation documentation; drink‑driving offender programme.

FAQ

Q: What is this standard?

A: EN 50436‑4:2022 defines the electrical connection and digital interface between an alcohol interlock and a vehicle (physical connector, pinout, power management and the LIN/CAN message-level protocol). It is the interface specification used when integrating interlocks into vehicles.

Q: What does it cover?

A: It covers connector properties and assignments, data bus specification for LIN and CAN (J1939), communication states and message frames, power/activation/deactivation rules, signal validation/error handling, system safety analysis and conformance testing procedures (with informative annexes containing example LDF/DBC files and a proposed test plan).

Q: Who typically uses it?

A: Manufacturers of alcohol interlocks, vehicle manufacturers and integrators, certification and test laboratories, road‑safety programme administrators, and professional installers — anyone responsible for producing, integrating, testing or certifying vehicle‑mounted alcohol interlock systems.

Q: Is it current or superseded?

A: The 2022 edition is the current EN edition and supersedes EN 50436‑4:2019. National adoptions (e.g., BS EN 50436‑4:2022) were published in mid‑2022. Users should confirm national implementation/endorsement dates for their country.

Q: Is it part of a series?

A: Yes — EN 50436 is a multi‑part CENELEC series on alcohol interlocks (parts include device performance and test methods, installation and vehicle interfacing). Part 4 specifically addresses the vehicle connection and digital interface.

Q: What are the key keywords?

A: Alcohol interlock, vehicle interface, LIN, CAN J1939, connector/pinout, activation/deactivation, conformance testing, hazard analysis, ISO 26262.