Oldsmobile 1999 Alero - Manual (Page 162)

yellow blue
4-10
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.
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 prefer.
To turn the system on or off,
press the ETS button on
the console.
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.