ISO 16750-1:2018

INTERNATIONAL ISO
STANDARD 16750-1
Third edition
2018-11
Road vehicles — Environmental
conditions and testing for electrical
and electronic equipment —
Part 1:
General
Véhicules routiers — Spécifications d'environnement et essais de
l'équipement électrique et électronique —
Partie 1: Généralités
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
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
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: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Classification by mounting location . 2
4.1 Engine compartment . 2
4.2 Passenger compartment . 3
4.3 Luggage compartment/load compartment . 3
4.4 Mounting on the exterior/in cavities . 3
4.5 Other mounting locations . 3
5 Operating modes . 3
5.1 Operating mode 1 . 3
5.2 Operating mode 2 . 4
5.3 Operating mode 3 . 4
6 Functional status classification . 4
6.1 General . 4
6.2 Class A . 4
6.3 Class B . 4
6.4 Class C . 4
6.5 Class D . 5
6.6 Class E . 5
7 Tests and requirements . 5
7.1 General . 5
7.2 General test conditions . 5
7.3 Test sequence . 5
8 Designation . 5
8.1 Coding . 5
8.2 Use of Code Z “as agreed” . 6
Annex A (informative) Example for a test sequence plan . 8
Annex B (informative) Example of life test/statement of reliability . 9
Bibliography .13
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 of 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 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 third edition cancels and replaces the second edition (ISO 16750-1:2006), which has been
technically revised.
The main change compared to the previous edition is the extension of the variety of operating modes,
so that not only “typical” load may be applied during the test but also maximum and minimum load.
A list of all parts in the ISO 16750 series can be found on the ISO website.
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.
iv © ISO 2018 – All rights reserved

Introduction
The concept of the ISO 16750 series is to assist its user in systematically defining and/or applying a
set of internationally accepted environmental conditions, tests and operating requirements which are
based on the anticipated actual environment in which the equipment will be operated and exposed to
during its life cycle.
The following environmental factors have been considered in the development of this document:
— World geography and climate: Road vehicles are owned and operated in nearly all land regions of
the Earth. Significant variation in environmental conditions due to climatic environment, including
diurnal and seasonal cycles, can therefore be expected. Consideration has been given to worldwide
ranges in temperature, humidity, precipitation and atmospheric conditions including dust, pollution
and altitude.
— Type of vehicle: Environmental conditions in and on road vehicles can depend on vehicle design
attributes such as engine type, engine size, suspension characteristics, vehicle mass, vehicle size,
electrical supply voltage and so on. Consideration has been given to typical types of vehicles
including commercial (heavy) trucks, passenger cars and trucks and diesel and gasoline engines.
— Vehicle use conditions and operating modes: Environmental conditions in and on the vehicle vary
significantly with road quality, type of road surface, road topography, vehicle use (e.g. commuting,
towing, cargo transport, etc.) and driving habits. Operating modes such as storage, starting, driving,
stopping and so on have been considered.
— Equipment life cycle: Electrical and electronic equipment is also resistant to environmental
conditions experienced during manufacture, shipping, handling, storage, vehicle assembly and
vehicle maintenance and repair. Such conditions and test (e.g. handling drop test) are within the
scope of the ISO 16750 series.
— Vehicle supply voltage: Supply voltage varies with vehicle use, operating mode, electrical
distribution system design and even climatic conditions. Faults within the vehicle electrical system,
such as overvoltage alternator and intermittencies in connection systems, can occur. Such conditions
are within the scope of the ISO 16750 series.
— Mounting location in the vehicle: In current or future car concepts, systems/components are
mounted in almost any location of the car. The environmental requirements for each specific
application highly depend on its mounting location. Each location in a car has its distinct set of
environmental loads. As an example, the range of temperatures in the engine compartment differs
significantly from the range in the passenger compartment. This is also true for the vibration loads.
But in this case, not only the vibration levels are different, the type of vibration load also varies.
Body mount components are typically exposed to random vibrations whereas for engine mount
systems/components the additional sine vibration from the engine is considered. Devices installed
in doors are exposed to a high number of mechanical shocks from door slamming additionally.
It is desirable for the car manufacturer to group the different environmental load types and levels in
a reasonable number of standard requirement sets. This strategy makes it possible to carry systems/
components from one car project to another. Furthermore, the exact requirement levels are often
unknown when designing a component for a future car concept. The expected environmental loads
are usually compiled from other car concepts with similar conditions. The grouping is normally done
by mounting location, but it is difficult to define the right number of different mounting locations and
respective load profiles, because there is a conflict of aims between having only few requirement classes
and tailoring to the requirement levels for each application. The reason is that the environmental loads
are not only depending on the mounting location. There are other major factors that affect the stress
levels for systems/components. For examples, body styles, drive-train concepts or package densities
can create absolutely different requirement levels for devices that are installed in different cars at
almost the same location.
The concept of the ISO 16750 series is to define requirement classes for separate load types. It
distinguishes between electrical, mechanical, thermal, climatic and chemical loads. For each load type,
several requirement classes are defined. Every requirement class is determined by a specific code letter.
The complete environmental requirement set is created by defining the code letter combination. The
code letters are defined in the respective clauses of this document. Additionally, tables in the annexes
of each part consists of usual mounting locations and define examples of their respective code letters.
For normal applications, these code letters are used. If an application is very specific and therefore the
given code letter combinations cannot be used, it is possible to create new code letter combinations
to serve this purpose. In case none of the given code letters is useable, new requirement levels can be
created by using the code letter Z. In this case, the specific requirements need to be defined separately
but it is desirable not to change the test methods.
It is recommended to consider at least the following mounting locations for a device under test (DUT)
with respect to thermal, mechanical, climatic and chemical load.
0.1 Applicability to manufacturers’ responsibility
Due to technology limitations or variations in vehicle design, the vehicle manufacturer may be required
to place a component in a location where it cannot withstand the environmental conditions described
in the ISO 16750 series. Under these circumstances, it is the responsibility of the vehicle manufacturer
to provide the necessary environmental protection.
0.2 Applicability to wiring harnesses, cables and electrical connectors
Although some environmental conditions and tests in the ISO 16750 series may be relevant to vehicle
wiring harnesses, cables and connectors, its scope is not sufficient to be used as a complete standard.
It is therefore not recommended that the ISO 16750 series be directly applied to such devices and
equipment. Applicable standards are taken into account.
0.3 Applicability to parts or assemblies in or on equipment
The ISO 16750 series describes environmental conditions and tests to be applied to electrical and
electronic equipment directly mounted in or on the vehicle. It is not intended for direct application to
parts or assemblies that are part of the equipment. For example, the ISO 16750 series should not be
directly applied to integrated circuits (ICs) and discrete components, electrical connectors, printed
circuit boards (PCBs), gauges, displays, controls, etc. that are attached in or on the equipment. Electrical,
mechanical, climatic and chemical loads for such parts and assemblies can be quite different from those
described in the ISO 16750 series.
On the other hand, it is desirable to use the ISO 16750 series to help derive environmental conditions
and test requirements for parts and assemblies that are intended for use in road vehicle equipment. For
example, a temperature range of −40 °C to 90 °C may be specified for an assembly contained inside a
piece of equipment having a temperature range of −40 °C to 70 °C and a temperature rise of 20 °C.
0.4 Applicability relative to system integration and validation
The user of the ISO 16750 series is cautioned to understand that the scope of the ISO 16750 series is
limited to conditions and testing at the equipment level, and therefore does not represent all conditions
and testing necessary for complete verification and validation of the vehicle system. Environmental
and reliability testing of equipment parts and vehicle systems may be required.
For example, the ISO 16750 series does not necessarily ensure that environmental and reliability
requirements for solder joints, solderless connections, integrated circuits, and so on are met. Such
items are assured at the part, material or assembly level. Likewise, vehicle and system level testing is
required to validate the equipment in the vehicle application.
vi © ISO 2018 – All rights reserved

INTERNATIONAL STANDARD ISO 16750-1:2018(E)
Road vehicles — Environmental conditions and testing for
electrical and electronic equipment —
Part 1:
General
1 Scope
The ISO 16750 series applies to electric and electronic systems/components for vehicles. It describes
the potential environmental stresses and specifies tests and requirements recommended
...