Newb question...How do these lights work?

Do they come on every 5k pr 10k after they've been reset or is it supposed to be more regular like at the 10k, 20k, 30k, etc. odometer mile markers.

My car has 76xxx miles and the light just came on. I figured out in 5 sec. how to reset it on the dash before grabbing my obd II code scanner. Would that light even give me a code?

Drivers.lexus site only shows a 75k service recommendation which I read. But my car is a ways past 75k.

 

From what I understand, by default, they come on at a regular interval of 5,000 miles regardless of the status of your vehicle. You can change the interval in the vehicle settings though.