What is this button for? 2012 Ford Fusion Hybrid

It ought to be in the handbook if it’s something that was factory installed on the vehicle.

For the Ford Fusion Hybrid, visit https://www.startmycar.com/us/info/manuals/2012#google_vignette

It appears to be aftermarket. Something like an alarm system, maybe. Who knows?

Passenger ejection button.

seems aftermarket. Perhaps a kill switch, lights from the previous owner, or anything else

It might be able to change the brightness of the light on your instrument panel. At night, I always turn mine down. Just enough light for me to see it. By preventing eye tiredness, you can improve your night vision when driving at night.

Spontaneous combustion

In a 2012 Ford Fusion Hybrid, the button you’re referring to beneath the light switch is probably the Electronic Stability Control (ESC) Off switch. You can deactivate the stability and traction control systems by pressing it. Currently disabled systems are indicated by the red light. If you require additional wheel spin in conditions with limited grip, such as mud or snow, this feature may come in handy.

If you don’t click the button and the light remains on, there may be an ESC system problem that has to be fixed.

That’s what chatgpt, who is intelligent, says.

potentially a kill switch? just a random guess that kills your lights while you’re driving

Since we have liftgates on our Ford work trucks, I’m guessing that’s a non-OEM edition.

It’s for the hand that pops out and flips people off

Oil slick (Cue the Peter Gunn theme).