Hyundai Repair: speed sensor, remanufactured computers, dillema

Question
The wiring looks ok on it.  It looks like the person who owned it before me had the same issues.  The wiring looks like it was moved around and looked at and I noticed the computer says remanufacturd.  It isn't an original hyundai one.  This speed sensor dillema is killing me.  I have replaced all the sensors I can think of.  Also my airbag light is on.   Is there a reset procedure to that?  Too many lights on my dash lol.  The p0500 code comes on after I make 2 trips IE I go out, come back, then on my way out again, I get that code.

Answer
The wire I'm referring to is the one that runs from the ECM to the ABS control module, not the wires coming from the sensor.  

Which computer was replaced?  Hyundai doesn't offer OE remanufactured computers, so this already sounds like it could be the problem.

The airbag light can be reset with a dealer scan tool if there are no problmes with the system.  If there's a problem, the air bag lamp will come back.  You air bag system will likely be disabled while the warning lamp is on.  The fact that the lamp is on indicates there was a problem.  You should have this diagnosed.  I don't know whether places other than the dealer will be able to do this; their software and scan tools may not be able to communicate with the air bag system.