I believe that Jetson has a good approach. I'm not familiar with 4 wheel ASB, but seems logical to me if all you need to do is pull the fuse to disable it, why not give it a try. If you would like I can check my manual for my 97 and see if there is a diagnostic chart for the ABS system and send you a copy by e-mail. I'm sure the shop has done everything the manual has suggested, but maybe it will be of some use.