What would cause all of the lights to blink simultaneously like hazard lights?

The service and repair manual with diagram will provide you step by step help to locate and fix the problem easily and you will get the manual from the given link https://toolsnyou.com/

What is a hazard switch and where is it located?
The hazard switch allows you to turn on your hazard or emergency flasher lights. When you press the button, all four of your turn signal lights will flash simultaneously. This is a useful way to warn other drivers of potential hazards or to make your vehicle visible during a breakdown, especially at night, and is an important safety feature of any vehicle.

The hazard switch is frequently mounted on the dashboard. Sometimes it is mounted to the steering column or attached to the turn signal switch. The button is marked with one triangle inside another triangle. This part is also commonly referred to as a hazard or emergency flasher switch, hazard or emergency light switch, hazard warning switch, or simply just a flasher switch.

The hazard switch contacts must be stuck together causing constantly flashing signalling .

Check to make sure the correct bulbs are in the sockets and as Karl said check the grounds. An incorrect bulb can make one blink faster and a bad ground can cause one to blink that way.

This works for a ford taurus so I thought I would put my 2 cents worth in. Sometimes the Hazard button plays havoc with the lighting system. If there is a hazard button on the steering shaft, try putting a toothpick to wedge the button one way or the other. A jiggling button will cause the same system if the connectors to the lights are tight and the grounds are good. Hope this helps

Yes, I replaced the relay box and it worked.

you could have a bad flasher unit causing this.you say hazard/flasher not working.do you mean just the signals not working and think the hazards won`t work or are the hazards not working.there are two flasher units one for signal and one for hazards.you could have a problem with the signal switch as well.

a short in the tilt steering coulem typical...ford and gm problem

Sounds like a ground problem on one or more of the light modules.