Data Link Connector: Description and Operation

DLC:

DATA LINK CONNECTOR (DLC)
The provision for communicating from vehicle to scanner is the DLC. It is usually located under the instrument panel and is sometimes covered by a plastic cover labeled "DIAGNOSTIC CONNECTOR." It is used in the assembly plant to receive information in checking that the engine is operating properly before it leaves the plant. The connector can also be used by the service technician to identify Powertrain Control Module (PCM) stored trouble codes.

NOTE: There are two different types of DLC connectors, a 12 terminal and a 16 terminal. ONLY the 12 terminal connector which is equipped with a terminal "B" will flash Diagnostic Trouble Codes (DTCs) through the "Service Engine Soon" / Malfunction Indicator Lamp (MIL).