ISO 26262-9-2018 PDF

Full title and description

Road vehicles — Functional safety — Part 9: Automotive safety integrity level (ASIL)-oriented and safety-oriented analyses. This part of ISO 26262 defines requirements and methods for ASIL‑oriented and safety‑oriented analyses used in the functional safety lifecycle for electrical/electronic (E/E) systems in road vehicles.

Abstract

ISO 26262-9:2018 specifies requirements for ASIL‑oriented and safety‑oriented analyses including requirements decomposition (ASIL tailoring), criteria for coexistence of elements, analysis of dependent failures, and general safety analyses. Annex A provides an overview of objectives, prerequisites and work products associated with these analyses. The document is intended for safety‑related E/E systems in series production road vehicles (mopeds excluded).

General information

• Status: Published (Edition 2, 2018).
• Publication date: December 2018 (2018-12).
• Publisher: International Organization for Standardization (ISO); national adopters such as BSI publish identical national versions.
• ICS / categories: 43.040.10 (Electrical and electronic equipment).
• Edition / version: Edition 2 (2018).
• Number of pages: 29 (ISO published document page count).

Scope

This part of ISO 26262 applies to safety‑related systems that include one or more electrical and/or electronic (E/E) systems installed in series production road vehicles (excluding mopeds). It addresses hazards caused by malfunctioning behaviour of safety‑related E/E systems (including interaction between systems), and specifies the framework and requirements for ASIL‑oriented and safety‑oriented analyses used during the functional safety lifecycle. It does not address hazards such as electric shock, fire or toxicity unless they are directly caused by E/E malfunctioning behaviour, nor does it address nominal (non‑fault) performance.

Key topics and requirements

• Requirements decomposition and ASIL tailoring to allocate or reduce ASILs across elements and components.
• Criteria for coexistence of elements and the safe integration of multiple functions.
• Analysis of dependent failures (systematic and random dependencies between elements).
• Safety analyses covering functional and technical safety aspects, and the definition of necessary work products.
• Guidance on tailoring the safety lifecycle when integrating existing systems or altering systems released before this edition.
• Annex A: overview of objectives, prerequisites and expected work products for the analyses defined in this part.

Typical use and users

Used by automotive OEMs, system and component suppliers, safety engineers, verification and validation teams, systems architects, and consultants involved in functional safety. Typical activities include ASIL derivation and decomposition, dependent‑failure analysis, safety case preparation, and integration of safety analyses into company development processes.

Related standards

ISO 26262-9 is one part of the ISO 26262 series (Parts 1–10) on automotive functional safety. It complements other parts such as Part 3 (concept phase), Part 4 (product development at system level), Part 5 (hardware), Part 6 (software), and Part 10 (guidelines). ISO 26262 itself is the automotive adaptation of broader functional safety concepts found in IEC 61508.

Keywords

ASIL, ASIL tailoring, safety‑oriented analysis, functional safety, ISO 26262, dependent failures, coexistence criteria, safety lifecycle, automotive E/E systems.

FAQ

Q: What is this standard?

A: ISO 26262-9:2018 is Part 9 of the ISO 26262 series, titled "Automotive safety integrity level (ASIL)-oriented and safety-oriented analyses", which defines requirements and methods for ASIL‑oriented analyses used in the automotive functional safety lifecycle.

Q: What does it cover?

A: It covers requirements decomposition (ASIL tailoring), criteria for coexistence of elements, analysis of dependent failures, and safety analyses for safety‑related E/E systems in series production road vehicles. It provides work‑product and objective guidance (see Annex A).

Q: Who typically uses it?

A: Automotive OEMs, suppliers, systems and safety engineers, architects, V&V teams and consultants who perform ASIL derivation, decomposition, dependent‑failure analysis and related safety lifecycle activities use this part of ISO 26262.

Q: Is it current or superseded?

A: The current published edition is ISO 26262-9:2018 (Edition 2, published December 2018), which replaced ISO 26262-9:2011. A working draft to revise Part 9 (ISO/WD 26262-9.2) is under development and intended to replace the 2018 edition when published.

Q: Is it part of a series?

A: Yes — ISO 26262 is a multi‑part international standard addressing functional safety for road vehicles (Parts 1 through 10), and Part 9 is one element of that series.

Q: What are the key keywords?

A: ASIL, ASIL tailoring, safety‑oriented analysis, dependent failures, coexistence criteria, functional safety, automotive E/E systems, ISO 26262.