Theft System Indicator
WARNING: This page is about a different car, the 2002 GMC Savana, 2002 Chevrolet Chevy Express, 2001 GMC Savana, and 2001 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
Instrument Panel Cluster (IPC) illuminates SECURITY indicator as determined by Vehicle Theft Deterrent (VTD) system. VTD system requests IPC to illuminate the indicator only when ignition switch is in RUN position. VTD system uses indicator as a malfunction indicator.