If your wipers move at all, it's not the motor. And since the only relay in the wiper system is in the intermittent circuit itself, if it was bad, it would only account for the intermittent mode not working.

It's most likely your wiper mode switch that has a fault. Whether it's just a misaligned, dirty, or burnt contact, or something else that can be repaired without having to buy an entire new switch you'd only know if you took it apart.