Data Link Connector (DLC)
The 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 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 provide a power
ground at Pin 4 and a clean signal ground at Pin 5.
The class 2 serial data communications circuit is provided at Pin 2
of the DLC.
The E and C serial data communications circuit is provided at Pin 14
of the DLC.
Class 2 Serial Data Link
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 Interface Unit (VIU), if equipped |
The Class 2 serial data link allows a scan tool to communicate with
the above modules for diagnostic and testing purposes.
