2005 Buick Century Owner's Manual - Page 176

The ETS operates in THIRD (3) and AUTOMATIC OVERDRIVE (X). If the vehicle is in THIRD (3), the system can upshift the transaxle to AUTOMATIC OVERDRIVE (X). The ETS is turned off in SECOND (2) or FIRST (1) gear, and when the parking brake is set. See Automatic Transaxle Operation on page 2-21. While the ETS is on, this warning light will come on the instrument panel cluster to show that the system is not limiting wheel spin. To turn the system off, move the gear shift lever to FIRST (1) or SECOND (2) gear. See "Rocking Your Vehicle To Get It Out" under If You Are Stuck: In Sand, Mud, Ice or Snow on page 4-30. When the system is turned off, the TRAC OFF warning light will come on and stay on. If the ETS is limiting wheel spin when the system is turned off, the TRAC OFF light will come on - but the ETS will not turn off right away. It will continue to operate until there is no longer a need to limit wheel spin. See Enhanced Traction System Warning Light on page 3-34. Adjust your driving accordingly. To limit wheel spin, especially in slippery road conditions, the ETS should always be left on. But the system can be turned off. The ETS 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 To Get It Out" under If You Are Stuck: In Sand, Mud, Ice or Snow on page 4-30. 4-10