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 agreements. All DLCs are required to provide
a power supply, B+ at all times, to pin 16. This positive supply 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.
Class 2 Serial Data Link
The class 2 serial data link in this vehicle is configured in a star
which means, there is no redundant path for the serial data to flow through, in the
event that the conductor feeding a module develops an open condition that module will
not be able to communicate. The following modules use the class 2 data link
network to communicate with each other:
| • | The electronic brake control module (EBCM) |
| • | The powertrain control module (PCM) |
| • | The inflatable restraint sensing and diagnostic module (SDM) |
| • | The transmission control module (TCM) |
| • | The multifunction alarm module/chime module (MAM) |
| • | The instrument panel cluster (IPC) |
| • | The remote control door lock receiver (RCDLR) |
The class 2 serial data link allows a scan tool to communicate with the
above modules for diagnostic and testing purposes.
