2010 Cadillac STS Owner's Manual - Page 240

Traction Control System (TCS) Warning Light The TCS warning light comes on briefly when the engine is started. Lane Departure Warning (LDW) Light For vehicles with the lane departure warning system, this light briefly comes on green while starting the vehicle. If it does not, have the vehicle serviced by your dealer/retailer. If the Traction Control System (TCS) warning light comes on and stays on, there may be a problem with the TCS. The light also comes on if the TCS is turned off using the traction control on/off button located on the console. If this light stays on or comes on while driving, pull off the road as soon as possible and stop carefully. Turn the engine off and then restart it. If the light still stays on or comes back on again while driving, the vehicle needs service. Have the TCS inspected as soon as possible. See Traction Control System (TCS) on page 5‑9 and StabiliTrak® System on page 5‑6 for more information. If it does not, have the vehicle serviced by your dealer/retailer. If the system is working normally the indicator light then goes off. This light also comes on green if the system detects a left or right lane marking. It flashes, changes to amber, and three beeps sound, if a detected lane marking is crossed without using a turn signal. For more information, see the Index in the Navigation Manual. 4-60