Data link connector (automotive)
Encyclopedia
The Data Link Connector (DLC) is the multi-pin diagnostic connection port for automobiles and trucks used to interface a scan tool
with the control modules
of a given vehicle and access On-Board Diagnostics
and live data streams.
The OBD-II DLC (post-1996 vehicles) is usually located under the instrument panel on the driver side, though there are several exceptions. Prior to 1996, many DLC's were in the engine compartment, usually near the fuse block. Also, prior to 1996, there was no standardization for these connectors, and each manufacturer had its own shape with a unique pin arrangement. After 1996, many manufacturers retained their proprietary connectors in addition to the OBD-II interface, because OBD-II ports are only required to transmit emission-related codes and data.
Scan tool (automotive)
An automotive scan tool is an electronic tool used to interface with, diagnose and, sometimes, reprogram vehicle control modules.There are many types from just as many manufacturers, one of the most familiar being the Snap-On "brick", or MT2500/MTG2500...
with the control modules
Electronic control unit
In automotive electronics, electronic control unit is a generic term for any embedded system that controls one or more of the electrical systems or subsystems in a motor vehicle....
of a given vehicle and access On-Board Diagnostics
On-board diagnostics
On-Board Diagnostics, or OBD, in an automotive context, is a generic term referring to a vehicle's self-diagnostic and reporting capability. OBD systems give the vehicle owner or a repair technician access to state of health information for various vehicle sub-systems...
and live data streams.
The OBD-II DLC (post-1996 vehicles) is usually located under the instrument panel on the driver side, though there are several exceptions. Prior to 1996, many DLC's were in the engine compartment, usually near the fuse block. Also, prior to 1996, there was no standardization for these connectors, and each manufacturer had its own shape with a unique pin arrangement. After 1996, many manufacturers retained their proprietary connectors in addition to the OBD-II interface, because OBD-II ports are only required to transmit emission-related codes and data.