The ABS light is supposed to come on when you turn your van on or off. This
is so that you can see that the light works. The light doesn't go off until
the computers have checked the basic operation of the sensors and computers.
The light going on after a big bump is normal, as well. When there is big
bump, the wheel speed can change suddenly, more or less confusing the
system. The light goes on and then goes out after the computer has verified
everything is working normally.
Nothing to worry about. Your ABS brakes are working properly.
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