Read-To-Arm State
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The CTD system will be in the ready-to-arm state when the ignition switch is in the LOCK off position and any door opens. The BCM will request the security telltale to flash.