Hoping someone might have had this happen in the past and know the reason why. Wife was driving our 2006 Rav4 V6 4x4 Base this morning when the ABS, Emergency Brake and VSC warning lights all came on at once. She was coasting along on the highway and hadn't used the brakes when this happened. She gently applied the brakes and they were working so she pulled off to the side. After turning the car off and restarting the lights did not turn back on. She continued to work and the lights remained off. Any ideas as to why this might have happened?