Pontiac 2004 Grand Prix Owner's Manual page 141

Anti-Lock Brake System Warning
Light
If the ABS warning light comes on and stays on, there
may be a problem with the anti-lock portion of the brake
system. If the brake system warning light is not on,
you still have brakes, but you don't have anti-lock
brakes. See Brake System Warning Light on page 3-36 .
If your vehicle has the
Anti-lock Brake System
(ABS), this light will come
on when your engine is
started and may stay on
for several seconds.
That's normal.
If the light stays on, turn the ignition to OFF. If the light
comes on when you're driving, stop as soon as
possible and turn the ignition off. Then start the engine
again to reset the system. If the light still stays on,
or comes on again while you're driving, your vehicle
needs service. If the regular brake system warning light
isn't on, you still have brakes, but you don't have
anti-lock brakes. If the brake system warning light is
also on, you don't have anti-lock brakes and there's a
problem with your regular brakes. See Brake System
Warning Light on page 3-36 .
The anti-lock brake system warning light will come on
briefly when you turn the ignition key to RUN. This
is normal. If the light doesn't come then, have it fixed
so it will be ready to warn you if there is a problem.
3-37