Oldsmobile 2002 Alero - Manual (Page 127)

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The Enhanced Traction System warning light may come
on for the following reasons:
D If you turn the system off by pressing the ETS button
on the center console near the gear shift lever, the
warning light will come on and stay on. To turn the
system back on, press the button again. The warning
light should go off. See “Enhanced Traction System”
in the Index for more information.
D If the traction control system is affected by an
engine - related problem, the system will turn off
and the warning light will come on.
D If the vehicle is driven on an extremely rough road, the
warning light may come on momentarily but will go
off again when the vehicle leaves the rough surface.
If the Enhanced Traction System warning light comes
on and stays on for an extended period of time when the
system is turned on and the parking brake is fully
released, your vehicle needs service.
Enhanced Traction System Active Light
When your Enhanced
Traction System is
limiting wheel spin,
this light will come on.
Slippery road conditions may exist if the Enhanced
Traction System active light comes on, so adjust your
driving accordingly.
The light will stay on for a few seconds after the
Enhanced Traction System stops limiting wheel spin.
The Enhanced Traction System active light also comes
on briefly when you turn the ignition key to ON. If the
light doesn’t come on then, have it fixed so it will be
there to tell you when the system is active.