I don't have an AWD but do have a 98 S70. The ABS light on the dash should indeed light up briefly and then go out after turning the key on. I you do not see it light at all, the module may be faulty. However, normally if the module is not functioning correctly - it will light up all the time. It sounds as if you do have a problem - I am just wondering if possibly the light bulb to the ABS light in the dash is out or disconnected. Have you had the car awhile? Have you purposely tried to activate your anti lock brakes and know if the work? Can easily do this on dirt, water, or ice - just be carefull. Hope this helps, TB