1997 Toyota Corolla condenser-cooling fan and engine-cooling fan both stop working

1997 Toyota Corolla mileage: 150,000. My condenser-cooling fan and engine-cooling fan both stop working at the same time. I jumped both fan motors straight from the battery and they work. When I turn the air conditioner on the fans, they do not come on. I check all my fuses and relays and they seem to be all right. What else could cause both fans not to work because the engine-cooling fan will not come on to keep the engine temperature stable?