K 3500 Truck 4WD V8-454 7.4L VIN J SFI (1996)
Data Link Connector: Description and Operation
Circuit Operation
A Scan Tool can be connected to the Data Link Connector (DLC), this allows the Scan Tool to communicate with the Diesel Powertrain Control Module
(PCM) Gasoline Vehicle Control Module (VCM) the Diagnostic Energy Reserve Module (DERM), the Transfer Case Control Module or the Brake
Pressure Modulator Valve. System operations can then be monitored for diagnostic purposes.