oh didn't read your post properly, if your airbag light is on you can only get it turned off by Renault to the tune of £100+
When you are disconnecting airbags/pretensioners you should unplug the battery to prevent them going off (small chance but possible) and to prevent the airbag light coming on, then once you have the resistor in place you connect the battery back again and the cars computer doesn't know any different as it never had the power to detect the absence of an airbag when it wasn't there. (and breath)