2002 Buick Century Owner's Manual - Page 187

The Enhanced Traction System operates in THIRD (3) and OVERDRIVE ( ). If you are in THIRD (3), the system can upshift the transaxle to OVERDRIVE ( ). The Enhanced Traction System is turned off in SECOND (2) or FIRST (1) gear. See "Automatic Transaxle" in the Index. B B When the system is on, this warning light will come on to let you know if there's a problem. See "Enhanced Traction System Warning Light" in the Index. When this warning light is on, the system will not limit wheel spin. Adjust your driving accordingly. To limit wheel spin, especially in slippery road conditions, you should always leave the Enhanced Traction System on. But you can turn the system off if you ever need to. You should turn the system off if your vehicle ever gets stuck in sand, mud or snow and rocking the vehicle is required. See "Rocking Your Vehicle" in the Index. To turn the system off, your gear shift lever must be in FIRST (1) or SECOND (2) gear. See "Rocking Your Vehicle" in the Index. When you turn the system off, the Enhanced Traction System warning light will come on and stay on. If the Enhanced Traction System is limiting wheel spin when you turn the system off, the warning light will come on -- but the system won't turn off right away. It will wait until there's no longer a current need to limit wheel spin. Also, if you set the parking brake, the system will turn off. You can turn the system back on at any time by shifting to OVERDRIVE ( ) or THIRD (3). The Enhanced Traction System warning light should go off. B 4-10