Quote Originally Posted by jmt455 View Post
This is the ABS introduction from the 2005 Owner's Manual:

If your vehicle has anti-lock brakes, this warning light on the instrument panel will come on briefly when you start your vehicle.

When you start your engine, or when you begin to drive away, your anti-lock brake system will check itself. You may hear a momentary motor or clicking noise while this test is going on, and you may even notice that your brake pedal moves or pulses a little. This is normal.
You are correct as what the noise is...its a self check only should do it when the car is in motion its also checking the speed sensors... some times it will happen at other times, when this happens maybe time to check your wheel sensor for dirt build up..