Data link connector

The data link connector (DLC) is the multi-pin diagnostic connection port for automobiles, trucks, and motorcycles used to interface a scan tool with the control modules of a given vehicle and access on-board diagnostics and live data streams.

[1] Prior to 1996, many OBD-I data link connector'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.

The OBD-II DLC (post-1996 vehicles) is usually located under the instrument panel on the driver side, though there are several exceptions.

The OBD-II connector is required to be within 2 feet (0.61 m) of the steering wheel or, if the manufacturer has applied for an exemption, at least somewhere within reach of the driver.