it's strange that you didnt get closed circuit fault code too there as iirc that plug must have a shorting clip in it, maybe you closed it when you pushed the resistor in... try at C0257(attached), unplug that one and read the code... if you get open circuit code plug the resistor there in the female side(i dont remember well but this one might have a shorting clip too)
i must ask again just to be 100% sure cos it's strange, do you get OPEN CIRCUIT fault code with the airbag unplugged?