2007 4.7L Tundra rear left wheel speed sensor malfunction

I have a 2007 4.7L Tundra that is having a rear left wheel speed sensor malfunction. ABS and VSC lights are continuously on while 4HI/ 4LO blink constantly.

I am trying to locate a wiring diagram for this circuit to aid in troubleshooting. Other advice or recommendations would be welcome. My next step is to check continuity from the ABS control unit to the speed sensor. See below for further details.

The wire from the axle to the speed sensor and the speed sensor themselves are intact. Interestingly the voltage to the distal end of the wire that runs from the ABS control unit to the sensor wire located at the axle will read ~12V upon startup, then rapidly fall to around 1-3V.

This allows the vehicle to be shut off, moved into or out of 4WD, and then restarted. It does not allow shifts to/from 4WD while on the move. I am concerned if this fails completely that I will be stuck without 4WD, which can be a safety concern where I live. I would be content to have no ABS with functioning 4WD but it appears that this is not easy to achieve on this generation of Tundra. If someone knows a relatively simple way to do this I would love to hear it. Thanks in advance for all of the advice.

 

https://www.tundras.com/threads/ultimate-tundra-wiring-diagrams-collection.81448/