Data Link Connector: Description and Operation

The DLC is a standardized 16 cavity connector. Connector design and location is dictated by an industry wide standard, and is required to provide the following:
^ Scan tool power battery positive voltage at terminal 16.
^ Scan tool power ground at terminal 4.
^ Common signal ground at terminal 5.
^ Class 2 serial data at terminal 2.
^ Keyless entry program enable signal at terminal 8.

All DLCs are required to provide a power supply, hot at all times, to pin 16. This circuit is used to power the scan tool. All DLCs supply a power ground at pin 4 and a clean signal ground at pin 5.

The Class 2 serial data circuit is provided at pin 2 of the DLC.