I just removed the black box and the wires that went with it. I'm really stuck here

 

The green key flashing means the PCM (powertrain control module) that is the brains of the car doesn't recognize your key. If this key flashing is new, then plug in that black box.

This will not prevent the starter motor from engaging and turning the engine. The flashing green key light will prevent fuel (or spark) at the engine, but the starter motor will not be affected.

Tackle one problem at a time.

 

I reconnected the box and it did the same thing. Is there any other way to check the PCM to make sure it's recognizing or not recognizing the key?

 

The continously flashing key is the pcm signal that it is not recognizing the key. If you had a scanner that can read some car specific data, you might be able to verify.

Like I said before, the starter not engaging the engine is not related to the wiring mess you have under your dash. When you turn the key, that starter should crank the engine normally. The engine likely will not run on its own where you normally release the key and the car is ready to drive.

Is the starter now behaving normally?

 

It's doing the same as before. Just the whizzing sound when I turn the key. Can a locksmith verify if my PCM is working normally and recognizing the key?

 

A locksmith can try to re-program the key. I'd hold off, because you might have bigger issues to address first.

I'm wondering if the timing belt broke or is possibly missing with the sound you are describing. There is an access panel on the lower part of the transmission that you can remove. You can have an assistant try to start the car while you watch the flywheel. If the flywheel is spinning, you have bigger issues to address first.

You could also pull the valve cover and crank the engine by hand and see if the cam sproket moves as well.

 

Thanks I'll try that tomorrow. I'll keep you updated

 

If it spins does that mean the timing belt broke?

 

If the flywheel spins when attempting to start the car then you know the starter is engaging the flywheel.

If you crank on the 19 mm bolt on the crankshaft with the valve cover removed and the top half doesn't spin, then you have a broken timing belt.