2003 Cadillac CTS Owner's Manual - Page 264

To turn the system off, press the TC (traction control) button located in the glove box. StabilitrakR - Vehicle Stability Enhancement System (If Equipped) If you press the TC button once, the traction control system will turn off and the traction control system warning light will come on. Press the TC button again to turn the system back on. If you press and hold the TC button for five seconds, the Stabilitrak system will turn off. Press the TC button again to turn Stabilitrak back on. Your vehicle may be equipped with a vehicle stability enhancement system called Stabilitrak. Stabilitrak is an advanced computer controlled system that assists you with directional control of the vehicle in difficult driving conditions. Stabilitrak has sensors that detect the direction your vehicle is going and compares it to the direction that you are steering the vehicle. Stabilitrak activates when the computer senses a discrepancy between your intended path and the direction the vehicle is actually traveling. To assist you in returning your vehicle to the intended path, Stabilitrak selectively applies braking pressure at any one of the vehicle's brakes to help steer the vehicle in the direction which you are steering. When the system activates, a STABILITY SYS ENGAGED message will be displayed on the Driver Information Center. See "Driver Information Center Messages" in the Index. You may also hear a noise or feel vibration in the brake pedal. This is normal. Continue to steer the vehicle in the direction you want it to go. If there is a problem detected with Stabilitrak, a SERVICE STABILITY SYS message will be displayed on the Driver Information Center. See "Driver Information Center Messages" in the Index. When this message is displayed, the system is not operational. Driving should be adjusted accordingly. Stability comes on automatically whenever you start your vehicle. To help assist you with directional control of the vehicle, you should always leave the system on. You can turn Stabilitrak OFF if you ever need to trough the Traction On/Off button. See "Traction Control System" in the Index. 4-10