Circuit/System Description
WARNING: This page is about a different car, the 2007 Buick Lucerne. However, it is still accessible from the selected car via links, so may be relevant.
When the ignition is turned ON, the object alarm detection system performs tests to diagnose critical malfunctions within the system. When the object alarm detection system has completed the power-up mode, the object alarm module will establish communication with the body control module (BCM). During the power-up mode the object alarm module will check for a valid calibration data set, if no valid calibration data set is found, the object alarm module will disable the system and command the red indicator ON.