Mid Speed GMLAN Circuit Description

The data link connector (DLC) allows a scan tool to communicate with the mid speed GMLAN serial data circuit. Modules connected to the mid speed GMLAN serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules when the ignition switch is in any position other than OFF. The mid speed GMLAN serial data bus uses a terminating resistor that is in parallel with the mid speed GMLAN (+) and (-) circuits.