A friend said that all of his warning lights came on. The car is still running okay. Any ideas? 2020 Fit EX CVT.

 

I'm replying to myself. He brought the car to his mechanic and it's okay now. He used his Fit as a jumper to start another car, and that drew the voltage down too low and set off the warning lights. I'm not sure what the mechanic did, but the warning lights are all out now.

 

Probably just cleared the error code(s). Since the car's systems are all inter-linked, one error cascades into a disco of warning lights and disfunction. When my mom's 2020 EX got a flat tire on the blue ridge parkway, my cousin (long story) put the spare on. The spare isn't the same rolling diameter as the rest of the wheels, so the TPMS/ABS/VSA (it's all one unit) threw an error. The CMBS and adaptive cruise rely on the ABS unit for brake application, so they threw up warning lights.
"EEEE! My tires don't match!" *throws a fit* (lol)

 

The wonders of electronics!

 

Just remember, when x-mas light shows up, check out the battery first.