Post on Bimmerforums about ASC delete says 10ohm resistor does it on 6 cyl car.
http://www.bimmerforums.com/forum/sh...54#post9444754 Using ohms law, 12V at 10 ohms is 1.2 amps and 14.4Watts of heat to dissipate (but the post says only a 1 watt resistor is needed?)
Maybe the ASC motor gets a lot less than 12V but if it were me, I'd start with a 400ohm resister and work down from there and see what the highest value that tricks the ABS/ASC circuit into thinking it's connected.
You could also measure the resistance of the motor, match that and use an online ohms law calculator to see what wattage resistor was needed.
Steve