2004 Oldsmobile Alero Owner's Manual - Page 184

When the system is on and the parking brake is fully released, this warning light will come on to let you know if there's a problem. To turn the system on or off, press the ETS button on the center console. See Enhanced Traction System Warning Light on page 3-30. 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 prefer. 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 press the button to turn the system off, the warning light will come on and the indicator light will go off - but the system won't turn off right away. It will wait until there's no longer a current need to limit wheel spin. You can turn the system back on at any time by pressing the button again. The Enhanced Traction System warning light should go off. 4-10