ISO INTERNATIONAL STANDARD 26262-4 Second edition 2018-12 Road vehicles Functional safety - Part 4: Product development at the system level Vehicules routiers -Sécurité fonctionnelle - Partie 4:Developpement duproduit auniveau dusysteme Reference number ISO 26262-4:2018(E) ISO @IS0 2018 IS026262-4:2018(E) COPYRIGHTPROTECTEDDOCUMENT IS02018 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting below or Iso's member body in the country of the requester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone:+4122749 0111 Fax: +41 22 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2018 - All rights reserved IS026262-4:2018(E) Contents Page Foreword ..V Introduction. ..vi 1 Scope. 2 Normative references ..2 3 Terms and definitions 4 Requirements for compliance ..2 4.1 Purpose. .2 4.2 General requirements 4.3 Interpretations oftables. .3 4.4 ASIL-dependentrequirementsand recommendations ..3 4.5 Adaptationformotorcycles. 4 4.6 Adaptation fortrucks,buses, trailers and semi-trailers .4 5 General topicsfor theproduct developmentat the systemlevel 5.1 Objectives.. .4 5.2 General ..4 6 Technical safety concept. ..5 6.1 Objectives. .5 6.2 General 6.3 Inputs to this clause. .6 6.3.1 Prerequisites .6 6.3.2 Further supporting information .6 6.4 Requirements and recommendations. .6 6.4.1 Specification of the technical safety requirements ..6 6.4.2 Safety mechanisms. 7 6.4.3 System architectural design specification and technical safety concept 6.4.4 SafetyAnalysesand avoidanceofsystematicfailures 9 6.4.5 Measures for control ofrandom hardwarefailures during operation .11 6.4.6 Allocationtohardwareandsoftware ..11 6.4.7 Hardware-software interface (HSI) specification .12 6.4.8 Production, operation, serviceand decommissioning .12 6.4.9 .13 Verification. 6.5 Work products ..14 Systemand item integrationand testing .14 7.1 Objectives. .14 7.2 General. .15 7.3 Inputs to this clause.. .15 7.3.1 Prerequisites ..15 7.3.2 Further supporting information .15 7.4 Requirements andrecommendations. .15 7.4.1 Specification of integration and test strategy .15 7.4.2 Hardware-software integration and testing ..17 7.4.3 Systemintegrationandtesting .19 7.4.4 Vehicle integration and testing .21 7.5 Work products. .24 Safetyvalidation .24 8 8.1 Objectives. 24 8.2 General 24 8.3 Inputs to this clause. 25 Prerequisites .25 8.3.1 Further supporting information .25 8.3.2 8.4 Requirements andrecommendations.. .25 @IS0 2018 -All rights reserved iii