ISO 26262-9:2018

Road vehicles — Functional safety — Part 9: Automotive safety integrity level (ASIL)-oriented and safety-oriented analyses

This document is intended to be applied to safety-related systems that include one or more electrical and/or electronic (E/E) systems and that are installed in series production road vehicles, excluding mopeds. This document does not address unique E/E systems in special vehicles such as E/E systems designed for drivers with disabilities. NOTE Other dedicated application-specific safety standards exist and can complement the ISO 26262 series of standards or vice versa. Systems and their components released for production, or systems and their components already under development prior to the publication date of this document, are exempted from the scope of this edition. This document addresses alterations to existing systems and their components released for production prior to the publication of this document by tailoring the safety lifecycle depending on the alteration. This document addresses integration of existing systems not developed according to this document and systems developed according to this document by tailoring the safety lifecycle. This document addresses possible hazards caused by malfunctioning behaviour of safety-related E/E systems, including interaction of these systems. It does not address hazards related to electric shock, fire, smoke, heat, radiation, toxicity, flammability, reactivity, corrosion, release of energy and similar hazards, unless directly caused by malfunctioning behaviour of safety-related E/E systems. This document describes a framework for functional safety to assist the development of safety-related E/E systems. This framework is intended to be used to integrate functional safety activities into a company-specific development framework. Some requirements have a clear technical focus to implement functional safety into a product; others address the development process and can therefore be seen as process requirements in order to demonstrate the capability of an organization with respect to functional safety. This document does not address the nominal performance of E/E systems. This document specifies the requirements for Automotive Safety Integrity Level (ASIL)-oriented and safety-oriented analyses, including the following: — requirements decomposition with respect to ASIL tailoring; — criteria for coexistence of elements; — analysis of dependent failures; and — safety analyses. Annex A provides an overview on objectives, prerequisites and work products of this document.

Véhicules routiers — Sécurité fonctionnelle — Partie 9: Analyses liées aux niveaux d'intégrité de sécurité automobile (ASIL) et à la sécurité

General Information

• Status: Published
• Publication Date: 16-Dec-2018
• ICS: 43.040.10 - Electrical and electronic equipment
• Technical Committee: ISO/TC 22/SC 32 - Electrical and electronic components and general system aspects
• Drafting Committee: ISO/TC 22/SC 32/WG 8 - Functional safety
• Current Stage: 9092 - International Standard to be revised
• Completion Date: 08-Jul-2024

Relations

• Revises: ISO 26262-9:2011 - Road vehicles — Functional safety — Part 9: Automotive Safety Integrity Level (ASIL)-oriented and safety-oriented analyses
• Effective Date: 05-Nov-2015

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 26262-9
Second edition
2018-12
Road vehicles — Functional safety —
Part 9:
Automotive safety integrity level
(ASIL)-oriented and safety-oriented
analyses
Véhicules routiers — Sécurité fonctionnelle —
Partie 9: Analyses liées aux niveaux d'intégrité de sécurité automobile
(ASIL) et à la sécurité
Reference number
©
ISO 2018
© ISO 2018
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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ii © ISO 2018 – All rights reserved

Contents Page
Foreword .v
Introduction .vii
1 Scope . 1
2 Normative references . 2
3 Terms and definitions . 2
4 Requirements for compliance . 2
4.1 Purpose . 2
4.2 General requirements . 2
4.3 Interpretations of tables . 3
4.4 ASIL-dependent requirements and recommendations . 3
4.5 Adaptation for motorcycles . 3
4.6 Adaptation for trucks, buses, trailers and semi-trailers. 4
5 Requirements decomposition with respect to ASIL tailoring . 4
5.1 Objectives. 4
5.2 General . 4
5.3 Inputs to this clause . 5
5.3.1 Prerequisites . 5
5.3.2 Further supporting information . 5
5.4 Requirements and recommendations . 5
5.5 Work products . 9
6 Criteria for coexistence of elements . 9
6.1 Objectives. 9
6.2 General . 9
6.3 Inputs to this clause . 9
6.3.1 Prerequisites . 9
6.3.2 Further supporting information .10
6.4 Requirements and recommendations .10
6.5 Work products .10
7 Analysis of dependent failures .11
7.1 Objectives.11
7.2 General .11
7.3 Inputs to this clause .12
7.3.1 Prerequisites .12
7.3.2 Further supporting information .12
7.4 Requirements and recommendations .12
7.5 Work products .14
8 Safety analyses .14
8.1 Objectives.14
8.2 General .15
8.3 Inputs to this clause .16
8.3.1 Prerequisites .16
8.3.2 Further supporting information .16
8.4 Requirements and recommendations .16
8.5 Work products .18
Annex A (informative) Overview of and document flow of Automotive Safety Integrity Level
(ASIL)-oriented and safety-oriented analyses .19
Annex B (informative) Example architectures for Coexistence of elements and
Decomposition of requirements .23
Annex C (informative) Framework for Identifying Dependent Failures .25
Bibliography .29
iv © ISO 2018 – All rights reserved

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives ).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents ).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: www .iso .org/iso/foreword .html .
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 32,
Electrical and electronic components and general system aspects.
This edition of ISO 26262 series of standards cancels and replaces the edition ISO 26262:2011 series of
standards, which has been technically revised and includes the following main changes:
— requirements for trucks, buses, trailers and semi-trailers;
— extension of the vocabulary;
— more detailed objectives;
— objective oriented confirmation measures;
— management of safety anomalies;
— references to cyber security;
— updated target values for hardware architecture metrics;
— guidance on model based development and software safety analysis;
— evaluation of hardware elements;
— additional guidance on dependent failure analysis;
— guidance on fault tolerance, safety related special characteristics and software tools;
— guidance for semiconductors;
— requirements for motorcycles; and
— general restructuring of all parts for improved clarity.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/members .html.
A list of all parts in the ISO 26262 series can be found on the ISO website.
vi © ISO 2018 – All rights reserved

Introduction
The ISO 26262 series of standards is the adaptation of IEC 61508 series of standards to address the
sector specific needs of electrical and/or electronic (E/E) systems within road vehicles.
This adaptation applies to all activities during the safety lifecycle of safety-related systems comprised
of electrical, electronic and software components.
Safety is one of the key issues in the development of road vehicles. Development and integration of
automotive functionalities strengthen the need for functional safety and the need to provide evidence
that functional safety objectives are satisfied.
With the trend of increasing technological complexity,
...