Scan Tool Diagnostics
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
Scan Tool (Tech 2) reads and clears current and history DTC's. Ensure scan tool contains correct software cartridge for SIR diagnostics. To use scan tool, connect it to Data Link Connector (DLC), located near base of steering column. Plug in power source and turn ignition on. Follow scan tool manufacturer instructions for communication with SIR system.