ABS light, no communication with scan tool

I had a growling in the left front and my ABS light came on intermittently. I took it in and had the hub and bearing replaced. The ABS light came on the very next day. When the technician attempted to hook it up to the scan tool, it was unable to communicate with the module. He was unable to pull any codes from the van. Everything works on the van. All the lights, all the chimes, all the heating controls, everything! I was wondering if there was possibly an accessory fuse that could be blown that was causing there to be a lack of communication between the scan tool and the module. (I know on older models, sometimes if the fuse for the cigarette lighter for blown, that would do it.) Any help you could offer would be greatly appreciated. That intermittent ABS light is driving me crazy! Thanks!