A light comes on..it looks like an inverted horse shoe with an

The little horse shoe-looking looking thing is actually supposed to be a cross-section of a tire. That would be your Tire Pressure Monitoring System (TPMS) trying to tell you to check the pressure in your tires because it has determined that one or more of them are low.

This is covered in the Owner's Manual.
If you don't have an Owner's Manual for your Hyundai, you can get one HERE

This is the warning light indicating tire pressure needs adjusting -- usually means tires are low on air, unless the tires have recently been "pumped up" and the air pressure is too high.

Charlie

Tire pressure

This is not a good warning light as it relates to your Braking system !!!

Brake system warning light

This light will remain illuminated when the handbrake is engaged. Illumination after releasing the handbrake may indicate low brake fluid level (MUST CHECK THIS IMMEDIATELY AND RECTIFY).

Hope the information is useful ... be extremely careful and attend to this warning immediately if it is still on with your handbrake off and brake fluid top up!

It's usually the window winder that presents the problem . Remove all visable retaining screws ie; Grab handle , Internal door opening lever , Button on top of panel (if applicable ) etc . The majority panel are a pop snap on type . Remove the winder lever withthe aid of a shoe lace or thin piece of cloth material, The winder is retained by a horse-shoe shaped spring clip. .... Pull the shoe-lace/ material in the opposite direction of the winder retainer clip and it will easily come off, but it is a spring clip and may fly off so be careful. Good luck

this is the low tire pressure warning

Does it look like the one toward the bottom of this page? http://www.aa1car.com/library/warning_lights_lexus.jpg
I'm pretty sure that is a tire pressure warning light. You can find a key for this in the owners manual if you have it still.

That sounds like your tire pressure monitoring system. It's just indicating that you have one of your tires low on air and your going to need to add some. 32 psi i believe.

Replace the horse shoes LOL

IT ALMOST SOUND LIKE YOUR CONDENSATION FROM YOU A/C UNIT IS STUCK IN THE DUCT AND THE FAN IS BLOWING IT AROUND. WITH YOUR A/C ON, SEE IF THE RUBBER HOSE THAT COMES DOWN OUT OF THE DUCT UNDER THE RIGHT SIDE OF THE VEHICLE IS CLOGGED. PUT A SMALL WIRE UP THROUGH THE HOSE AND CLEAR IT OUT. HOPE THIS HELPS. LET ME KNOW PLEASE. GOOD LUCK