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IEEE 1616a™
STANDARD FOR MOTOR VEHICLE EVENT DATA RECORDERS (MVEDRs) –
AMENDMENT 1: MOTOR VEHICLE EVENT DATA RECORDER CONNECTOR LOCKOUT
APPARATUS (MVEDRCLA).
SCOPE: Motor Vehicle Event Data Recorders (MVEDRs) collect, record, store
and export data related to pre-defined events in usage history. This
amendment defines a lockout protocol for MVEDR output data accessibility by
securing the vehicle output diagnostic link connector (DLC). This standard
does not prescribe data security within the vehicle electronic control units
(ECUs) or within the intra-vehicle communication and/or diagnostic networks
but instead defines ways and means to permit uniform, but controlled access
of electronic scan tools to the DLC for legitimate vehicle emissions status,
maintenance and/or repair. This standard also defines a means of maintaining
data security on the vehicle via a motor vehicle DLC connector lockout
apparatus (MVEDRCLA). The MVEDRCLA is applicable to vehicles and their
respective event data recorders for all types of motor vehicles licensed to
operate on public highways.
PURPOSE: Many light-duty vehicles, and increasing numbers of heavy
commercial vehicles, are equipped with some form of a MVEDR. These systems
are diverse in function, and proprietary in nature, however, the SAE J1962
(ISO/DIS 15031-3) vehicle diagnostic link connector (DLC) has a common
design and pinout, and is thus universally used to access event data
recorder information. Data access via the DLC can be accomplished by using
scan tools or microcomputers and network interfaces. This same DLC and
network interface is also used for re-calibrating electronic control units
on a vehicle. Such ECU applications can include restraint controls, engine
controls, stability controls, braking controls, etc. This amendment defines
a protocol to protect against misuse of electronic tools which use the DLC
to erase, modify or tamper with electronic controller or odometer readings,
or to improperly download data. Implementation of MVEDRCLA provides an
opportunity to voluntarily achieve DLC security by standardizing a MVEDRCLA
which will act to prevent vehicle tampering, which can include odometer
fraud, illegal calibrations leading to emissions violations and theft of
personal data. Adoption of this standard will therefore make the common
MVEDR/DLC data more secure and credible while still permitting accessibility to legitimate end users.
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