the first code is security like you said, you can have that tuned out with a tuning program. you would need a local with a tuner to do that. or go to a dealer to fix it.

the 2 nd code i found this thread, Grand Prixs Of North America • View topic - P1573 could be more bad wires or the ecbm is bad. a abs scan would tell more where to look. that scan you need to go a shop to have done, and most will charge you to scan the car. but its better then just guessing and tossing money at it.