TCS Switch LED
WARNING: This page is about a different car, the 2004 Saturn Ion Red Line, 2004 Saturn Ion 3, 2004 Saturn Ion 2, and 2004 Saturn Ion 1. However, it is still accessible from the selected car via links, so may be relevant.
Whenever the TCS switch LED is illuminated TCS is available. This will default ON every time the vehicle is started. The TCS can be disabled by pressing the switch. The TCS Switch and LED is controlled by the BCM.