That's because someone added an aftermarket control unit

By automatic I mean there is a rain sensor and the wipers come on and vary their speed automatically.

If your car is a 1985 or older someone on the forums sells a programmable delay relay which fits. Once I get my SDL back I'll write a How-To on installing a programmable wiper relay from a 90s VW Passat

-J

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.