How does a garage door know not to close if you push the button when a car is coming out?

I think your safety light may not be aligned properly.

If you disconnect the chain from the door (like you would do if the electricity went out and you needed to get the car in/out). Can you easily open and close the door by yourself? (it should not slam when closing).

If not then your springs could be bad or not set to the correct torque.

If you can open and close easily the door then there could be a issue with the motor or the gearing. BTW sears does not make garage door openers. They have OEM's rebrand their with sear's label. You don't need to have sear come out maybe a generic garage door person or even a handyman. But unless it's under warranty it won't be free.

Push and hold the two outer buttons until the LED flashes fast Approx (15 seconds) then hold your garage opener up to the mirror or visor and push and hold any button 3 or 4 seconds on the opener Now the Home Link is programed. With the car safely away from the closing garage door find and push the garage openers red programming button (on the motor assembly somewhere that gives you about 30 seconds to push your cars home link button so the garage opener learns the button you want to use for that door the other two buttons can be programed for other doors or house light controler gate opener in the same manner

If the main light flashes 10 times when the door reverses to the open position it is a door sensor problem. Make sure the sensors are pointed at one another and the small light on each one is lit and not flickering. Tweak them a bit. If you cannot get both lights to come on you have bad sensors.

Check the door sensors. They must be pointed at one another and the small light on each one must be lit and not flickering. Tweak them a bit. If you cannot get both lights to come on you have either a bad sensor or the wiring to them is shorted or broken.

Check your door sensors. The need to be pointed at one another and make sure the small light on each one is lit and not flickering. Tweak them a bit. If you can't get both lights to come on one of your sensors has failed.

I think the trolley has jammed against the bolt just in front of the motor unit. Remove the bolt and then run the door until it is closed. With the door closed locate the 'up limit' control on the side of the motor unit. Turn this 2 turns in the opposite direction of the arrow printed on the cover. Replace the bolt.

If the small light in your wall control is blinking it is in the lock mode. Press and hold for 3 seconds the button with the icon of a lock. This will toggle the lock function off.

You have a door sensor problem. Make sure the sensors are pointed at one another and the small light on each one is lit and not blinking. Also check the wiring.

IF U HAVE TWO EYE,SENSORS ON EACH SIDE OF THE DOOR SEE IF SOMETHING IS BLOCKING THE EYES OR SOETHING IS COVERING THEM, OR THEY ARE OUT OF ALIGNMENT, ONE SHOULD SHOW GREEN, AND ONE RED EYE, GOOD LOCK