Contents Wiring diagrams Section: Communication Devices All sections

Data Link Communications System: Overview Chevrolet Tahoe I

WARNINGVehicles are equipped with air bag supplemental restraint system. Before attempting any repairs involving steering column, instrument panel or related components, see SERVICE PRECAUTIONS SERVICE PRECAUTIONS and DISABLING & ACTIVATING AIR BAG SYSTEM in AIR BAG RESTRAINT SYSTEMS article.
CAUTIONWhen battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION before disconnecting battery.

A scan tool can be connected to the Data Link Connector (DLC), allowing the scan tool to communicate with the Inflatable Restraint Sensing and Diagnostic Module (IRSDM), Electronic Brake Control Module (EBCM) and PCM/VCM. System operations can then be monitored for diagnostic purposes.