My key does not have a lock or unlock or panic button. It is solely just to start the car. Two days ago, attempting to unlock the car, myself and one other passenger began to press the door locks at the same time, by accident, and soon the security alarm started going off, as well as the horn, the headlights were flashing and we were locked in, until I put the key in the ignition. But now my horn does not work!! I took the car to a mechanic but they do not know what is the problem. I need help!!

 

Does your brake lights work when you press on the brake pedal? If not, check under-hood Fuse No. 12 (15A).

If the brake lights then there may be an issue with the multiplex integrated control unit (MICU) that is part of the under-dash fuse box.