It's very simple. If the ABS system is there, it has to work. You can't just take the bulb out and leave the modulator in there as it will be clear that it has abs, so it's a testable item. Now, if you remove the ABS components, modulator, ecu, sensors ect then you cannot test it if it's not there. Therefore it's tested as a car without ABS. I have removed most, if not all the ABS components from my car
