GM Service Manual Online
For 1990-2009 cars only

Data Link Connector (DLC)

The data link connector (DLC) terminal 2 contains the class 2 serial data link.

The DLC also provides a power source for the scan tool as follows:

    • Battery voltage at the DLC terminal 16 (circuit 40).
    • Ground at terminal 4 (circuit 150) and terminal 5 (circuit 451).

Class 2 Serial Data Link

The class 2 serial data link allows the following modules to communicate with each other:

    • The body control module (BCM)
    • The electronic brake control module (EBCM)
    • The instrument panel cluster (IPC)
    • The powertrain control module (PCM)
    • The inflatable restraint sensing and diagnostic module (SDM)
    • The radio

The class 2 serial data link allows a scan tool to communicate with the above modules for diagnostic and testing purposes.