Data Link Connector (DLC)
The data link connector (DLC) is a standardized 16-way connector located
below the instrument panel and close to the steering column. Both the connector design
and location are dictated by industry wide agreement to follow SAE J1962 standards.
All data link connectors are required to provide a power supply, hot at all
times, to Pin 16. This circuit is used to power the scan tool. All data link
connectors provide a power ground at Pin 4 and a clean signal ground at Pin 5.
Class 2 Serial Data Link
The class 2 serial data communications circuit is provided at Pin 2
of the data link connector (DLC).
The class 2 serial data link allows the following modules to communicate
and share data with each other:
| • | Body control module (BCM) |
| • | Electronic brake control module (EBCM) |
| • | HVAC control module (w/CJ2) |
| • | Inflatable restraint sensing and diagnostic module (SDM) |
| • | Instrument panel cluster (IPC) |
| • | Powertrain control module (PCM) |
| • | Vehicle communications interface module (VCIM), if equipped |
The class 2 serial data link allows a scan tool to communicate with the
above modules for diagnostic and testing purposes.
E and C Serial Data Link
The E and C serial data communications circuit is provided at
Pin 14 of the data link connector (DLC).
The E and C serial data link allows the following modules to communicate
and share data with each other:
| • | Vehicle communications interface module (VCIM), if equipped |
