2004 Buick Regal Owner's Manual - Page 173

The TCS operates in all transaxle shift lever positions. But the system can upshift the transaxle only as high as the shift lever position that was chosen, so use the lower gears only when necessary. See Automatic Transaxle Operation on page 2-21. While the TCS is on, the TRAC OFF light could come on the instrument panel cluster to show that the TCS is not limiting wheel spin. To turn the TCS on or off, press the TRACTION button located directly behind the automatic transaxle shift lever on the instrument panel. See Traction Control System (TCS) Warning Light on page 3-33. Adjust your driving accordingly. To limit wheel spin, especially in slippery road conditions, you should always leave the TCS on. But you can turn the system off if you ever need to. The TCS should be turned off if the vehicle ever gets stuck in sand, mud or snow and rocking the vehicle is required. See Rocking Your Vehicle in If You Are Stuck: In Sand, Mud, Ice or Snow on page 4-30. When the TCS is turned off, the TRAC OFF warning light will come on. It will disappear when the TCS is turned back on. If the TCS is limiting wheel spin when the TRACTION button is pressed, the TRAC OFF light will come on and the TCS will turn off right away. 4-11