Heater blower not working replaced blower, resistor, switch and relay?

First, I would check for blown fuse #2 in the fuse panel in the engine bay. Next, I would check the ground g12 behind the right kick panel. Here is a guide to help you test for power and ground at the blower motor:

https://www.2carpros.com/articles/blower-fan-motor-works-on-high-speed-only

Here are the blower motor wiring diagrams so you can see how the system works. Check out the images (below). Please let us know what happens.