National foreword

This British Standard is the UK implementation of EN 50436‑4:2022. It supersedes BS EN 50436‑4:2019, which is withdrawn.

The UK participation in its preparation was entrusted to Technical Committee AUE/16, Data Communication (Road Vehicles).

A list of organizations represented on this committee can be obtained on request to its committee manager.

Contractual and legal considerations

This publication has been prepared in good faith, however no representation, warranty, assurance or undertaking (express or implied) is or will be made, and no responsibility or liability is or will be accepted by BSI in relation to the adequacy, accuracy, completeness or reasonableness of this publication. All and any such responsibility and liability is expressly disclaimed to the full extent permitted by the law.

This publication is provided as is, and is to be used at the recipient’s own risk.

The recipient is advised to consider seeking professional guidance with respect to its use of this publication.

This publication is not intended to constitute a contract. Users are responsible for its correct application.

Compliance with a British Standard cannot confer immunity from legal obligations.

This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2022.

This European Standard was approved by CENELEC on 20 June 2022. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and United Kingdom.

European foreword

This document ( EN 50436‑4:2022) has been prepared by CLC/BTTF 116‑2 “Alcohol Interlocks”.

The following dates are fixed:

This document will supersede EN 50436‑4:2019 and all of its amendments and corrigenda (if any).

EN 50436‑4:2022 includes the following significant technical changes with respect to EN 50436‑4:2019:

— Clause 3, terms and definitions, definitions were added for CAN and DBC;

— Clause 4.2, the CAN data bus was added as new data bus connection;

— Clause 4.3.3, the option to switch off the power supply to the alcohol interlock was included;

— Clause 4.5, the activation of the alcohol interlock was specified;

— Clause 4.6, the deactivation of the alcohol interlock was specified;

— Clause 5, the clause was simplified and updated;

— Clause 6, the alcohol interlock communication state Service was deleted;

— Clause 7.5, the specification of CAN services was added;

— Clause 8, the clause was updated and some communication state parameters were updated and clarified;

— Clause 9, the clause was updated;

— Clause 10, new clause was added to provide a link to the test plan in Annex H;

— Annex A, figures were updated to meet communication states;

— Annex B, tables were updated to meet new transition requirements;

— Annex C, the annex was reworked completely;

— Annex D, the annex was updated;

— Annex E, the annex was updated;

— Annex F, a sample DBC file was added as Annex;

— Annex G, the annex was updated;

— Annex H, the proposed test plan was added as an informative Annex.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Any feedback and questions on this document should be directed to the users’ national committee. A complete listing of these bodies can be found on the CENELEC website.

Introduction

The purpose of alcohol interlocks is to enhance traffic safety by preventing persons with alcohol concentrations exceeding a set limit value from driving a motor vehicle. The EN 50436 series specifies test methods and essential performance requirements for alcohol interlocks and gives guidance for decision makers, purchasers and users.

There are several areas in which alcohol interlocks may be used:

installed in a vehicle as a general preventive measure for the promotion of traffic safety, on a voluntary base or required legally in certain vehicles (e.g. vehicles for children transport), or
in vehicles as ordered by a court or an administrative authority as part of a drink-driving offender programme, or
for persons subject to a medical or rehabilitation programme.

Alcohol interlocks are often intended for after-market installation. For this purpose they have to be connected to the electrical circuits of the vehicle.

This installation of an alcohol interlock is expected not to interfere with the proper performance of the vehicle, nor to impair the safety and security of the vehicle; and to be as easy and as fast as possible. Additionally, the installation costs should be low in relation to the total cost of the alcohol interlock.

Therefore, it is desirable to have a standardised interface between alcohol interlocks and vehicles.

The alcohol interlock suppliers are expected to detail all the information that they will use/send. All used data/information is expected to respect the cyber security protocol and rules of the vehicle.

NOTE A new standard ISO/SAE 21434 to define requirements for cybersecurity engineering is under preparation.

All data required by the alcohol interlock from the vehicle is expected to be defined clearly and not be transferred outside the vehicle if this digital communication is used.

1 Scope

This document specifies the interface between an alcohol interlock for production and aftermarket installation and a vehicle. It details the modes of electrical connections, the assignment of electrical connection lines as well as the information to be exchanged between the vehicle and the alcohol interlock.

This document is applicable to alcohol interlocks for drink-driving-offender programmes (as in EN 50436‑1) as well as to alcohol interlocks for general preventive use (as in EN 50436‑2).

This document is mainly directed at manufacturers of alcohol interlocks and at vehicle manufacturers.

This document is referenced in EN 50436‑7 and provides details of the preferred data bus connection suggested therein.

NOTE This document describes the information exchange using a LIN or a CAN (J1939) connection.

2 Normative references

3 Terms and definitions

4 Connection between alcohol interlock and vehicle

4.1 Installation documentation

4.2 Data bus specification

4.3 Properties of a connector

4.4 Behaviour of the vehicle

4.5 Activation of the alcohol interlock

4.6 Deactivation of the alcohol interlock following a shutdown request

4.7 Maintaining power to the alcohol interlock

5 Basic connection architecture for the data bus

6 Communication

6.1 General

6.2 Communication states of the vehicle

6.3 Communication states of the alcohol interlock

6.4 Interaction between vehicle and alcohol interlock

7 Implementation of the communication states

7.1 General

7.2 Coding of data bus signals

7.3 Signal Validation and error handling

7.4 LIN identifiers and services

7.5 CAN-Services

8 Communication states and corresponding messages

8.1 Vehicle communication states and corresponding frames

8.2 Interlock communication states and corresponding frames

9 System safety analysis

10 Testing

Bibliography

BS EN 50436-4:2022

Alcohol interlocks. Test methods and performance requirements - Connection and digital interface between the alcohol interlock and the vehicle

Current

Published:

31 Aug 2022