prEN 50436-4

Alcohol interlocks - Test methods and performance requirements - Part 4: Connection and digital interface between the alcohol interlock and the vehicle

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.

Alkohol-Interlocks - Prüfverfahren und Anforderungen an das Betriebsverhalten - Teil 4: Verbindung und digitale Schnittstelle zwischen dem Alkohol-Interlock und dem Fahrzeug

Dieses Dokument legt die Schnittstelle zwischen einem Alkohol-Interlock und einem Fahrzeug für die Erstausrüstung und die Nachrüstung fest. Sie beschreibt im Detail die Art der elektrischen Verbindungen, die Zuordnung der elektrischen Verbindungen sowie die Informationen, die zwischen dem Fahrzeug und dem Alkohol-Interlock auszutauschen sind. Dieses Dokument ist sowohl für Alkohol-Interlocks für Programme mit Trunkenheitsfahrern (wie in EN 50436-1) als auch für Alkohol-Interlocks für den allgemein präventiven Einsatz (wie in EN 50436-2) anwendbar. Dieses Dokument richtet sich hauptsächlich an Hersteller von Alkohol-Interlocks und an Fahrzeughersteller. Auf dieses Dokument wird in EN 50436-7 verwiesen und sie stellt die Details der darin vorgeschlagenen bevorzugten Datenbusverbindung bereit. ANMERKUNG Dieses Dokument beschreibt den Informationsaustausch mittels einer LIN- oder einer CAN- Verbindung (J1939).

Ethylotests antidémarrage - Méthodes d'essais et exigences de performance - Partie 4: Connexion et interface numérique entre l'éthylotest antidémarrage et le véhicule

Le présent document spécifie l'interface entre un éthylotest antidémarrage, en vue de sa production et de son installation après mise sur le marché, et un véhicule. Il décrit les modes de branchement électrique, l'affectation des lignes de branchement électrique, ainsi que les informations qui doivent être échangées entre le véhicule et l'éthylotest antidémarrage. Le présent document est applicable aux éthylotests antidémarrage utilisés dans le cadre des programmes de lutte contre la conduite en état d'ivresse (voir EN 50436 1), ainsi qu'aux éthylotests antidémarrage à usage préventif général (voir EN 50436 2). Le présent document s'adresse essentiellement aux fabricants d'éthylotests antidémarrage, ainsi qu'aux constructeurs de véhicules. Le présent document est cité en référence dans l'EN 50436 7 et décrit la connexion de bus de données préférentielle qui est suggérée dans le présent document. NOTE Le présent document décrit l'échange d'informations au moyen d'une connexion LIN ou CAN (J1939).

Alkoholne zapore - Preskusne metode in zahtevane lastnosti - 4. del: Konektor in digitalni vmesnik med alkoholno zaporo in vozilom

General Information

• Status: Not Published
• Technical Committee: CLC/BTTF 116-2 - Alkohol-Interlocks
• Current Stage: 4099 - Decision to launch vote
• Due Date: 22-Dec-2021
• Completion Date: 22-Dec-2021
• Ref Project: oSIST prEN 50436-4:2021 - Alcohol interlocks - Test methods and performance requirements - Part 4: Connection and digital interface between the alcohol interlock and the vehicle

RELATIONS

• Revised: EN 50436-4:2019 - Alcohol interlocks - Test methods and performance requirements - Part 4: Connection and digital interface between the alcohol interlock and the vehicle
• Effective Date: 29-Dec-2020

Standards Content (sample)

SLOVENSKI STANDARD
oSIST prEN 50436-4:2021
01-oktober-2021
Alkoholne zapore - Preskusne metode in zahtevane lastnosti - 4. del: Konektor in
digitalni vmesnik med alkoholno zaporo in vozilom

Alcohol interlocks - Test methods and performance requirements - Part 4: Connection

and digital interface between the alcohol interlock and the vehicle

Alkohol-Interlocks - Prüfverfahren und Anforderungen an das Betriebsverhalten - Teil 4:

Verbindung und digitale Schnittstelle zwischen dem Alkohol-Interlock und dem Fahrzeug

Ethylotests antidémarrage - Méthodes d'essais et exigences de performance - Partie 4:

Connexion et interface numérique entre l'éthylotest antidémarrage et le véhicule
Ta slovenski standard je istoveten z: prEN 50436-4
ICS:
13.200 Preprečevanje nesreč in Accident and disaster control
katastrof
43.040.80 Sistemi za zaščito pri trku in Crash protection and
sistemi za zadrževanje restraint systems
potnikov
oSIST prEN 50436-4:2021 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 50436-4:2021
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oSIST prEN 50436-4:2021
EUROPEAN STANDARD DRAFT
prEN 50436-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2021
ICS Will supersede EN 50436-4:2019 and all of its
amendments and corrigenda (if any)
English Version
Alcohol interlocks - Test methods and performance requirements
- Part 4: Connection and digital interface between the alcohol
interlock and the vehicle

Ethylotests antidémarrage - Méthodes d'essais et Alkohol-Interlocks - Prüfverfahren und Anforderungen an

exigences de performance - Partie 4: Connexion et das Betriebsverhalten - Teil 4: Verbindung und digitale

interface numérique entre l'éthylotest antidémarrage et le Schnittstelle zwischen dem Alkohol-Interlock und dem

véhicule Fahrzeug
This draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2021-10-29.
It has been drawn up by CLC/BTTF 116-2.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CENELEC 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, the Czech Republic,

Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the

Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to

provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and

shall not be referred to as a European Standard.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Project: 73268 Ref. No. prEN 50436-4 E
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oSIST prEN 50436-4:2021
prEN 50436-4:2021 (E)
Contents Page

European foreword ......................................................................................................................... 5

Introduction ..................................................................................................................................... 6

1 Scope ..................................................................................................................................... 7

2 Normative references........................................................................................................... 7

3 Terms and definitions .......................................................................................................... 8

4 Connection between alcohol interlock and vehicle .......................................................... 9

4.1 Installation document ........................................................................................................... 9

4.2 Data bus specification .......................................................................................................... 9

4.2.1 General ................................................................................................................. 9

4.2.2 LIN Data Bus......................................................................................................... 9

4.2.3 CAN Data Bus....................................................................................................... 9

4.3 Properties of a connector ..................................................................................................... 9

4.3.1 Systems using a LIN data bus .............................................................................. 9

4.3.2 Systems using a CAN data bus .......................................................................... 10

4.4 Behaviour of the vehicle ..................................................................................................... 11

4.4.1 General ............................................................................................................... 11

4.4.2 Installation ........................................................................................................... 11

4.4.3 De-installation ..................................................................................................... 11

4.5 Activation of the alcohol interlock ....................................................................................... 11

4.6 Deactivation of the alcohol interlock following a shutdown request ................................... 11

4.7 Maintaining power to the alcohol interlock ......................................................................... 11

5 Basic connection architecture for the data bus .............................................................. 12

6 Communication .................................................................................................................. 12

6.1 General ............................................................................................................................... 12

6.2 The communication states of the vehicle ........................................................................... 12

6.2.1 General ............................................................................................................... 12

6.2.2 The vehicle communication state Protocol Validation ........................................ 13

6.2.3 The vehicle communication state Set Mode ....................................................... 13

6.2.4 The vehicle communication state Unset Mode ................................................... 13

6.2.5 The vehicle communication state Shutdown ...................................................... 13

6.2.6 Transitions from Unset Mode to Set Mode ......................................................... 14

6.3 The communication states of the alcohol interlock ............................................................ 14

6.3.1 General ............................................................................................................... 14

6.3.2 The alcohol interlock communication state Activated ......................................... 14

6.3.3 The alcohol interlock communication state Protocol Validation ......................... 15

6.3.4 The alcohol interlock communication state Service Information ........................ 15

6.3.5 The alcohol interlock communication state Warm Up ........................................ 15

6.3.6 The alcohol interlock communication state Test Request .................................. 16

6.3.7 The alcohol interlock communication state Analysing ........................................ 16

6.3.8 The alcohol interlock communication state Result ............................................. 16

6.3.9 The alcohol interlock communication state Wait Ignition .................................... 17

6.3.10 The alcohol interlock communication state Idle .................................................. 17

6.3.11 The alcohol interlock communication state Lockout ........................................... 18

6.3.12 The alcohol interlock communication state Error ................................................ 18

6.4 Interaction between vehicle and alcohol interlock .............................................................. 19

7 Implementation of the communication states ................................................................. 19

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prEN 50436-4:2021 (E)

7.1 General ............................................................................................................................... 19

7.2 Coding of data bus signals ................................................................................................. 19

7.2.1 General ............................................................................................................... 19

7.2.2 Vehicle to alcohol interlock ................................................................................. 19

7.2.3 Alcohol interlock to vehicle ................................................................................. 19

7.3 Signal Validation and error handling .................................................................................. 20

7.3.1 General ............................................................................................................... 20

7.3.2 Bus Wake up....................................................................................................... 20

7.3.3 Restart by the vehicle ......................................................................................... 20

7.3.4 Restart by the alcohol interlock........................................................................... 20

7.4 LIN identifiers and services ................................................................................................ 20

7.4.1 Identifiers ............................................................................................................ 20

7.4.2 Alcohol interlock status frame ............................................................................. 20

7.4.3 Assign Frame identifier ....................................................................................... 21

7.4.4 LIN Product identification of interlock system ..................................................... 21

7.4.5 Generic integration into vehicle .......................................................................... 21

7.4.6 Configuration....................................................................................................... 24

7.5 CAN-Services ..................................................................................................................... 24

7.5.1 Parameter Group Numbers ................................................................................ 24

7.5.2 Source Address ID .............................................................................................. 24

7.5.3 Function ID .......................................................................................................... 25

8 Communication states and corresponding messages .................................................. 25

8.1 Vehicle communication states and corresponding frames................................................. 25

8.1.1 Protocol Validation .............................................................................................. 25

8.1.2 Set Mode ............................................................................................................. 25

8.1.3 Unset Mode ......................................................................................................... 26

8.1.4 Shutdown ............................................................................................................ 26

8.2 Interlock communication States and corresponding Frames ............................................. 26

8.2.1 Coding of the blocking state and the non-blocking state indication.................... 26

8.2.2 Interlock Message Response: ................................................... 26

8.2.3 Interlock Message Response: ........................... 27

8.2.4 Interlock Message Response: ............................ 27

8.2.5 Interlock Message Response: ..................................................... 27

8.2.6 Interlock Message Response: .......................................... 28

8.2.7 Interlock Message Response: .................................................. 28

8.2.8 Interlock Message Response: ......................................................... 28

8.2.9 Interlock Message Response: ............................................ 29

8.2.10 Interlock Message Response: ............................................................... 29

8.2.11 Interlock Message Response: ...................................................... 30

8.2.12 Interlock Message Response: .......................................................... 30

9 System safety analysis ...................................................................................................... 30

10 Testing ................................................................................................................................. 30

Annex A (informative) Examples of vehicle – alcohol interlock interactions ....................... 31

Annex B (informative) State Transition tables ......................................................................... 38

Annex C (informative) Hazard Analysis and Risk Assessment in accordance with the

requirements of ISO 26262 ................................................................................................ 42

Annex D (informative) Example of a LIN 2.0 description file .................................................. 43

Annex E (informative) Example of a LIN 2.2 description file .................................................. 47

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prEN 50436-4:2021 (E)

Annex F (informative) Example of a J 1939 DBC file ............................................................... 51

Annex G (informative) Conformance testing ............................................................................ 56

Annex H (informative) Proposed Test Plan .............................................................................. 57

Bibliography ................................................................................................................................ 115

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oSIST prEN 50436-4:2021
prEN 50436-4:2021 (E)
European foreword

This document (prEN 50436-4:2021) has been prepared by CLC/BTTF 116-2 “Alcohol Interlocks”.

This document is currently submitted to the enquiry.
The following dates are proposed:
• latest date by which the existence of this (doa) dor + 6 months
document has to be announced at national
level
• latest date by which this document has to be (dop) dor + 12 months
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) dor + 36 months
conflicting with this document have to be (to be confirmed or
withdrawn modified when voting)

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

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oSIST prEN 50436-4:2021
prEN 50436-4:2021 (E)
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, is expected not to impair the safety and security of the vehicle, and is 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 standardized 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.
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oSIST prEN 50436-4:2021
prEN 50436-4:2021 (E)
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

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

EN 50436-1:2014, Alcohol interlocks - Test methods and performance requirements - Part 1:

Instruments for drink-driving-offender programs

EN 50436-2, Alcohol interlocks - Test methods and performance requirements - Part 2: Instruments

having a mouthpiece and measuring breath alcohol for general preventive use

EN 50436-7:2016, Alcohol interlocks - Test methods and performance requirements - Part 7: Installation

document

ISO 17987-1:2016, Road vehicles — Local Interconnect Network (LIN) — Part 1: General information

and use case definition

ISO 17987-2:2016, Road vehicles — Local Interconnect Network (LIN) — Part 2: Transport protocol and

network layer services

ISO 17987-3:2016, Road vehicles — Local Interconnect Network (LIN) — Part 3: Protocol specification

ISO 17987-4:2016, Road vehicles — Local Interconnect Network (LIN) — Part 4: Electrical physical

layer (EPL) specification 12 V/24 V

ISO/TR 17987-5:2016, Road vehicles — Local Interconnect Network (LIN) — Part 5: Application

programmers interface (API)

ISO 17987-6:2016, Road vehicles — Local Interconnect Network (LIN) — Part 6: Protocol conformance

test specification

ISO 17987-7:2016, Road vehicles — Local Interconnect Network (LIN) — Part 7: Electrical Physical

Layer (EPL) conformance test specification

ISO 17987-8:2019, Road vehicles — Local Interconnect Network (LIN) — Part 8: Electrical physical

layer (EPL) specification: LIN over DC powerline (DC-LIN)
SAE J1939 (series), Serial Control and Communications Heavy Duty Vehicle Network
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prEN 50436-4:2021 (E)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 50436-1:2014 and

EN 50436-7:2016 apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
motor
includes combustion engine, electric motor or hybrid power unit
3.2
odometer
instrument that indicates the distance travelled by the vehicle
3.3
passed breath test

breath test for which the user provided an accepted breath sample having a breath alcohol concentration

below the breath alcohol concentration limit
3.4
failed breath test

breath test for which the user did not provide an accepted breath sample or has provided an accepted

breath sample with an alcohol concentration equal to or above the breath alcohol concentration limit

3.5
lockout

condition in which the alcohol interlock will not accept a breath test and thereby prevents the user from

starting the vehicle motor for a predetermined period of time
Note 1 to entry: Lockout could be required by regulatory requirements.
3.6
Local Interconnect Network
LIN

serial network protocol used for digital communication between components in vehicles

3.7
LIN description file
LDF

file that is created in the LIN cluster design and parsed in the LIN cluster generation or by debugging

tools

Note 1 to entry: It contains LIN nodes, signals, frames and schedule table and other parameters relevant for

LIN communication in a LIN network.
3.8
Controller Area Network
CAN

vehicle bus standard designed to allow microcontrollers and devices to communicate with each other in

applications without a host computer
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prEN 50436-4:2021 (E)
3.9
Database Container File
DBC
CAN data description file format

Note 1 to entry: It is a text file that contains information for decoding raw CAN bus data to physical values.

4 Connection between alcohol interlock and vehicle
4.1 Installation document

The installation of an alcohol interlock shall be described in an installation document according to

EN 50436-7.

All extra parts that are required for the installation of an alcohol interlock according to prEN 50436-4

shall be specified by at least name and part number in the referring installation document according to

EN 50436-7.
4.2 Data bus specification
4.2.1 General

The information exchange between the alcohol interlock and the vehicle shall be performed via a LIN

data bus or a CAN Data bus.
4.2.2 LIN Data Bus
The LIN master is on the vehicle side.
The alcohol interlock system shall act as a LIN slave.

The LIN Master and the interlock as a LIN slave shall conform to at least one of the following

specifications: LIN Revision 2.0, LIN revision 2.1, LIN revision 2.2, LIN revision 2.2A, LIN according to

ISO 17987-1:2016, ISO 17987-2:2016, ISO 17987-3:2016, ISO 17987-4:2016, ISO/TR 17987-5:2016,

ISO 17987-6:2016, ISO 17987-7:2016, ISO 17987-8:2019 or later.
4.2.3 CAN Data Bus
The CAN data bus shall conform with the SAE J1939 series network protocol

NOTE For the information exchange between the alcohol interlock and the vehicle, a gateway can be used to

adapt to the requested communication standards (LIN or CAN). Both the alcohol interlock and gateway are handled

in the following standard as single units.
4.3 Properties of a connector
4.3.1 Systems using a LIN data bus

If the vehicle provides a connector at the end of cable harnesses or another specific location for the

connection to the alcohol interlock, the connector shall have at least 3 connections with the assignments

given in Table 1.

The exact type of the connector and pinout shall be specified in the installation document according to

EN 50436-7.

Examples of connectors can be Molex minifit 39-01-2060, Molex Duraclick 987650-8742 and Molex

Mini50 987652-1632. It is recommended to propose 6-pin connectors.
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oSIST prEN 50436-4:2021
prEN 50436-4:2021 (E)
Table 1 — Minimum pin assignment of a LIN connector
Pin Purpose Details
1 Battery feed of the +9 V to + 36 V
alcohol interlock
battery feed (terminal +30)
as specified in EN 50436-7:2016, Annex C, with the exception that
in the low power consumption mode of the alcohol interlock, the
vehicle may switch off the power supply to the alcohol interlock.
2 Ground for the voltage 0 V
supply of the alcohol
ground (terminal −30)
interlock and
data bus ground
3 Data bus high LIN High (ISO 17987 series)

NOTE 1 The sequence of pin numbering is arbitrary and for counting reasons only, e.g. lines are not necessarily

in adjacent cavities. The exact pin numbering is specified in the installation document according to

EN 50436-7:2016, Annex C, 3c.

NOTE 2 Pin 2 can be separated into two independent pins within a 4 pin connector.

4.3.2 Systems using a CAN data bus

If the vehicle provides a connector at the end of cable harnesses or another specific location for the

connection to the alcohol interlock, the connector shall have at least 4 connections with the assignments

given in Table 2.

The exact type of the connector and pinout shall be specified in the installation document according to

EN 50436-7.

Examples of connectors can be Molex minifit 39-01-2060, Molex Duraclik 987650-8742 and Molex

Mini50 987652-1632. It is recommended to propose 6-pin connectors.
Table 2 — Minimum pin assignment of a connector for CAN SAE J1939 series
Pin Purpose Details
1 Battery (+) +9 V to + 36 V
battery feed (terminal +30)
as specified in EN 50436-7:2016, Annex C, with the exception that
in the low power consumption mode of the alcohol interlock, the
vehicle may switch off the power supply to the alcohol interlock.
2 Battery (-) 0 V
ground (terminal −30)
3 CAN_H
4 unused
5 unused
6 CAN_L

NOTE The sequence of pin numbering is arbitrary and for counting reasons only, e.g. lines are not necessarily

in adjacent cavities. The exact pin numbering is specified in the installation document according to

EN 50436-7:2016, Annex C, 3c.
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4.4 Behaviour of the vehicle
4.4.1 General

The vehicle that is equipped with an alcohol interlock which is installed after this document shall not

enable the start of the motor or vehicle movement if it receives the information that the interlock is in the

blocking state or communication to the interlock is not possible or not plausible/unexpected.

The vehicle shall not cause a running vehicle motor to stop, even in the case of receiving a blocking

information from the interlock after a missed or a failed retest.
NOTE National regulation or special requirements can modify this requirement.
4.4.2 Installation

The vehicle shall conform to the behaviour of 4.4.1 after the first successful communication with the

alcohol interlock with a confirmed protocol validation.

The installation could require specified sequence of actions in order to install the alcohol interlock, that

shall be documented according to 4.1.

The installation procedure shall include a test that provides evidence for the successful installation of

the alcohol interlock.
4.4.3 De-installation

The de-installation could require specified sequence of actions in order to install the alcohol interlock,

that shall be documented according to 4.1.
4.5 Activation of the alcohol interlock
The vehicle shall activate the alcohol interlock if the vehicle is activated.

Vehicles that communicate with the alcohol interlock via LIN Bus shall make use of the LIN WAKE UP

procedure.
The LIN WAKE UP procedure shall not be performed by the alcohol interlock.

NOTE This is not a requirement for a breath test with each activation of the vehicle.

4.6 Deactivation of the alcohol interlock following a shutdown request

The alcohol interlock shall go into its low power consumption mode or a state where it can be switched

off by the vehicle without error no longer than 10s after the vehicle goes into its shutdown state and the

alcohol interlock has acknowledged this.
NOTE National regulations could require dif
...