2003 Cadillac CTS Owner's Manual - Page 158

Traction Control System Warning (TRAC OFF) Light If the TRAC OFF warning light comes on and stays on, there may be a problem with the traction control system. The light will also come on if you turn the traction control system OFF using the Traction On/Off button. The traction control TC button is located in the glove box. If the TRAC OFF light stays on or comes on while you are driving, pull off the road as soon as possible and stop carefully. Try resetting the system by turning the ignition off then back on. If the light still stays on or comes back on again while you are driving, your vehicle needs service. Have the traction control system inspected as soon as possible. See "Traction Control System" in the Index. The TRAC OFF light will come on briefly when you turn the ignition to ON. If it doesn't come on then, have it fixed so it will be ready to warn you if there is a problem. 2-90