Mainly you want to watch for the chest rising and falling. However, since this isn't always easy to see, you may want to lay your head on their chest and try to feel the rise and fall.
You can tell by listening to their heart, or check if they are breathing
Have someone call 911, provide a physical address. Check the area for hazards. Don't need additional victims. Check the victim-you have 3 minutes before brain damage if he is not breathing. Administer CPR until help arrives.
First, you would need to call the ambulance, and while the ambulance is coming, you would check her breathing, and etcetera.
Check the Situation Check the Habit Check the Accident
Fast blinking indicators usually indicates a bad relay. Check fuses and relays, and clean contacts if possible.
Check the fuse box(es) for a burnt fuse. Also, check to see if the front indicators work - if not, the flasher unit probably needs to be replaced.
Check for adequate breathing for 10 seconds; the chest should clearly rise for breathing to be effective.
Check for danger and ensure the area is safe. Check the person's airway, breathing, and pulse. If the person is breathing and has a pulse, place them in a recovery position. If the person is not breathing or does not have a pulse, call emergency services and begin CPR. Stay with the person until help arrives.
check that it is your car and check all the things such as tires indicators lights and did i mention to check that it is your car
Check your fuses.
Check for responsiveness by gently shaking and calling out to the person. If they do not respond, call emergency services immediately and check for breathing and a pulse. Then, carefully place the person in the recovery position while waiting for help to arrive.
If someone faints and needs first aid, lay them down on their back, elevate their legs, and loosen any tight clothing. Check their breathing and pulse. If they are not breathing, start CPR. Call for emergency medical help if needed.