Vanguard 2007 ABS ISSUE

If your mind is not gone yet read below.
Here's a video, while you've done what's in the video some of the comments are telling.
How to Test/Diagnose ABS system on a Semi Truck Trailer (youtube.com)
That ring gear should be allot cleaner! That can also read faulty if it’s so dirty
I've had many sensors appear good, ohms around 1200, ohms drop while spinning wheel, voltage goes up when spinning a wheel. But sensor was still bad
Best way to tell would be to use an oscilloscope but not likely you have one of those.
Find out how to get the blink codes from the light on the left rear of the trailer. He tells in the video but that may or may not work on your system.
Bendix sells a diagnostic unit that plugs into an adapter and the adaptor fits between the light cord and the trailer plug. But they run $400 - $500.

 

Wabco 6 is YE2 sensor
Haldex 6 is 3B sensor open circuit
No 66 code, 666 code run away. LOL
I use a lite check machine for ABS/Lights

 

The net says Wabco. You could also look for a tag if still there or a part number on the module. Should also be able to tell by the shape of the module and compare to pic of new part.
This link shows the YE2 sensor. See figure 1 on the first page.
tp20213.fm (sealcocvp.com)

 

Swap the YE1-YE2 leads at the ecm. If you 4 blinks then it's the YE2 sensor. Still get 6 blinks, most likely the ecm.

 

To add, 4 blinks is the YE1 sensor.

 

If you unplug and then plug the light cord back in and it works for awhile, you have a bad connection somewhere. Unplug both sides of the abs module and look for green/missing pin. That can give false codes. Had more than a few with that problem.