I am looking at purchasing a 1994 Jeep Cherokee, V8, 4X4. The owner had a Viper security system installed. Since the day of installation the ABS indicator light is on and the ABS does not function. Recently the 4X4 indicator light either stays on or does or does not go off but the 4X4 works. This vehicle is a full-time 4X4. The owner took the vehicle to a dealer to look at the ABS issue. The dealer indicated the Viper system was installed to close to the vehicle computer and that it was interfering. The installer said B.S. What could be the problems? I'm ok without ABS. Is this something indicating bigger issues? Any ideas?