What would cause simultaneous problems with my heating fan and wipers on a 2014 Honda Accord?

After getting gas for my car today and restarting it, my heating fan is now making a buzzing sound and my wipers are working noticeably slowly. I didn't check anything else, but the car seems to be otherwise okay. I will bring the car in for service, but would like to have an idea of what's going on.

A bad ground or a failing alternator. The battery can also be failing.

No way to know over the internet.