I had a bad Passenger side hub on mine that cause some humming noises... And I had an ABS and Brake light on together... I replaced the hub, that cured the humming and the ABS light went out...lol... Personally I like to check the hubs off the car... Any discoloration like a bluish tint, or roughness when you turn the hub means its shot... I know my drivers side hub is not so good..
If the AB light goes out, then the ABS system is functional... You need to check the Brake Fluid Res making sure its full and or the level sensor... Also you may have an issue with the parking brake...