Chevrolet 2002 Silverado 1500 Pickup Owner's Manual page 184

Anti-Lock Brake System Warning Light
If the light stays on, or comes on when you're driving,
your vehicle needs service. If the regular brake system
warning light isn't on, you still have brakes, but you
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don't have anti lock brakes. If the regular brake system
warning light is also on, you don't have anti
and there's a problem with your regular brakes. See
"Brake System Warning Light" earlier in this section.
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The anti lock brake system warning light should come
on briefly when you turn the ignition key to RUN. If the
light doesn't come on then, have it fixed so it will be
ready to warn you if there is a problem.
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With the anti lock brake
system, this light will
come on when you start
your engine and may stay
on for several seconds.
That's normal.
-
lock brakes
Low Traction Light (If Equipped)
You may feel or hear the system working or notice a
lack of accelerator response, but this is normal.
The LOW TRACTION light also comes on briefly when
you turn your ignition to RUN. If the light doesn't come
on then, the system may require service; have it fixed so
it will be there to tell you when the traction system is
active. Slippery road conditions may exist if this light
comes on, so adjust your driving accordingly.
If you have the Traction
Assist System, this light
will come on when the
system is limiting wheel
spin. See "Traction Assist
System" in the Index.