The bolt holding the arm onto the motor probably came loose. That's happened to me once or twice.
So it might not be catastrophic. Thats a good thing.
edit: crisis overted. the nut had backed off. i took the nut off so i could see whats up and there are a few teeth left inside the arm, next time i may not be so lucky. i will have to start checking with junkyards for another wiper arm and an abs wire.
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