ISO 21956:2019

INTERNATIONAL ISO
STANDARD 21956
First edition
2019-11
Road vehicles — Ergonomics aspects
of transport information and control
systems — Human machine interface
specifications for keyless ignition
systems
Véhicules routiers — Aspects ergonomiques des systèmes de
commande et d'information du transport — Spécifications d'interface
homme-machine pour des systèmes de démarrage sans clé
Reference number
©
ISO 2019
© ISO 2019
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ii © ISO 2019 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Design guidelines . 3
4.1 Actuation of keyless ignition control . 3
4.1.1 Actuation for emergency starting – Restarting the propulsion system after
unintended engine stall . 3
4.1.2 Actuation for starting – Design to avoid accidental starting – Stationary vehicle . 3
4.1.3 Actuation for stopping while a vehicle with automatic start/stop is in run mode . 3
4.1.4 Actuation for stopping (commercial vehicles only) – Design to avoid
accidental stopping - Stationary vehicle. 3
4.1.5 Actuation for emergency stopping – Interruption of starting . 3
4.2 Starting a propulsion system in case key code carrying device battery runs out . 3
4.2.1 Operation methods . 4
4.2.2 Instructions in case key code carrying device battery runs out . 4
4.3 Alerts and information to the driver . 4
4.3.1 Key left in vehicle . . . 4
4.3.2 Missing key code carrying device when starting vehicle propulsion system . 4
4.3.3 Ignition mode active at exit . 5
4.3.4 Ignition mode active at exit (commercial vehicles only) . 5
4.3.5 Key code carrying device leaves the vehicle . 5
4.3.6 Power shut off without key code carrying device . 6
4.3.7 Power shut off when not in “parked” or without activated parking brake
for automatic transmission vehicles . 6
4.3.8 Power shut off when not in “parked” or “neutral” for automatic
transmission vehicles (commercial vehicles only) . 7
4.3.9 Steering not unlocked . 7
Annex A (informative) Keyless ignition control use cases . 8
Bibliography .11
Foreword
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This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 39,
Ergonomics.
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iv © ISO 2019 – All rights reserved

Introduction
The conventional method of operating motor ignition systems requires use of a mechanical key. Keyless
ignition systems, that do not require the mechanical interface with the vehicle, improve driver’s
convenience and are becoming more widespread. This has created a need for immediate standardization
of the Human Machine Interface (HMI), since some drivers may have difficulty understanding how
to use these systems. This document complements SAE J2948, which covers the operation of keyless
ignition systems with the goal of helping to minimize user-initiated errors. That includes:
— the inability to start and stop the vehicle propulsion system,
— exiting the vehicle with the automatic transmission in a non-parking gear,
— exiting the vehicle while the vehicle propulsion system is enabled, and
— exiting the vehicle while the vehicle propulsion system is disabled, but the accessory or electrical
systems are active.
This document's scope differs from SAE J2948 as follows:
— actuation of keyless ignition control that is equipped with automatic start/stop systems,
— actuation to start or stop the vehicle propulsion system under emergency situations,
— actuation to start the propulsion system with low battery in the key,
— actuation of keyless ignition control without key code carrying device, and
— recommendations for detailed alerts and status indications identified with specific use-case
examples.
Many of these HMI issues vary among manufacturers and even among models from the same
manufacturer. To help clarify the use of keyless ignition systems, this document sets guidelines for
these new HMI solutions.
As additional explanation and support for developing specific requirements, keyless ignition control
use cases are provided as an Annex A.
INTERNATIONAL STANDARD ISO 21956:2019(E)
Road vehicles — Ergonomics aspects of transport
information and control systems — Human machine
interface specifications for keyless ignition systems
1 Scope
This document provides human machine interface (HMI) design specifications for keyless ignition
systems that use key code carrying device for passenger cars (including sport utility vehicles and light
trucks) and commercial vehicles (including heavy trucks and buses), independent of vehicle propulsion
system. HMI specifications for the electrical key functions include actuation in normal conditions,
emergencies, low battery, and avoidance of inadvertent actuations, alerts and specific non-standard
situations.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
key code
electronic code, which when transmitted to and stored in the starting system (3.4) software, allows the
driver to select a vehicle ignition mode using a keyless ignition control (3.3)
3.2
key code carrying device
physical device capable of transmitting an electronic key code (3.1) to the vehicle starting system (3.4)
3.3
keyless ignition control
permanently mounted physical device such as a pushbutton, rocker switch, multi-position control, or
rotary control used to perform ignition control such as start or stop a vehicle propulsion system (3.6)
without need for insertion or removal of a conventional key into/from an ignition slot
3.4
starting system
electronic system that controls the transition between ignition modes (3.5) related to the starting or
stopping of a vehicle based on driver’s request and vehicle conditions
3.5
ignition mode
propulsion and/or vehicle electrical states as determined by vehicle operating conditions and driver
actuation of the keyless ignition control (3.3)
3.5.1
start mode
transient mode where the vehicle propulsion system (3.6) is initiated (e.g. engine cranking), leading to
run mode (3.5.2), while an electronic key code is present in the starting system (3.4)
3.5.2
run mode
mode in which the vehicle propulsion system (3.6) is enabled, and an electronic key code is present in the
starting system (3.4)
Note 1 to entry: Automatic start/stop-equipped vehicles remain in run mode when automatic stop is engaged.
3.5.3
stop mode
mode in which the vehicle propulsion and vehicle electrical systems are disabled, and an electronic key
code is not present in the starting system (3.4)
Note 1 to entry: Vehicle manufacturers may choose to temporarily keep vehicle electrical systems active, and
the key code in the starting system in this mode until a trigger event occurs (such as a driver-door open event
or timer event). This vehicle state is sometimes provided to allow use of in-vehicle displays and entertainment
systems after the propulsion system is disabled.
3.5.4
electrical mode
accessory mode
mode in which the vehicle propulsion system (3.6) is disabled, the vehicle electrical system elements are
active as determined by the vehicle manufacturer, and an electronic key code is present in the starting
system (3.4)
3.5.5
lower ignition mode
modes, which are lower than the electrical mode (3.5.4)
Note 1 to entry: This applies to commercial vehicles only.
Note 2 to entry: These become important for commercial vehicles where the drivers must comply with valid driving
time regulations that separate between driving, resting and other work. The lower modes help to record time
periods spent on alternative activities. Examples of lower ignition modes can be living, parked or hibernate modes.
3.5.5.1
living mode
leisure mode
mode when driver is in the vehicle and can sleep or use some functions to support living in the vehicle
Note 1 to entry: It is necessary to ensure that some safety critical functions are available, e.g. burglar alarm.
3.5.5.2
parked mode
mode when vehicle is parked and not in use and no one is in the cab using the functions
Note 1 to entry: The time is counted to be compared with regulated driving and resting times.
3.5.5.3
hibernate mode
logistics mode
transition time from production to delivery to end customer delivery
Note 1 to entry: This secures very limited functionali
...