Need some help tackling a rear ABS wheel speed wiring harness replacement.

That sounds about right... Other thing you can do is look at as many images of that part that you can find online and confirm if it always comes with plug attached and not just bare wires and that will confirm that cutting through that material and then sealing it back up is the proper way to do it. Of course you could upgrade by replacing a portion of that material with a grommet.

 

Use a plastic dowel lightly pointed to push thru the rubber 3M body shutz or it aerosol equals will seal ya back up no worries.

 

As long as you don't increase or decrease the length of the wires the Ohms should stay the same... Of course the ohm could change dramatically if don't do a good soldering job.

 

If this is a gen 3 thread, the gen 3 wheel speed sensors make fixed-amplitude, logic-level signals. I'm skeptical of any comments you're finding that say the resistance is all that critical. The normal attention you would pay to not making a bad splice ought to be enough.

The skid ECU has an extra-sensitive Signal Check Mode you can place it into and drive around for a bit and see if it detects any hints of problems. The repair manual says to use this mode after any replacement of the bearings or speed sensors anyway. If you get through that extra-sensitive check, passing, you can be quite confident of your repair for normal use.

 

You shouldn't have to cut any insulation or plastic parts, and you should NEVER cut or splice any ABS wiring, I don't care what people are doing on youtube

Here's a factory service manual in PDF (you have to pay to see pics)
https://www.allcarmanuals.com/factory-service-manual-286-Toyota-Prius-XW30-ZVW30.html

Does TIS have access to service manuals?

On page 1220 it says you have to remove all the stuff on the rear floor, Like where the spare usually is and you should see the wiring coming through the wheel well.

I would just start removing interior trim. you'll eventually find the wire. It should be a 2 wire harness, and you are looking for a 2 pin connector, it will be inside the vehicle, not outside.

 

No I'm wrong it looks like it connects outside the vehicle, it's number 24 in this parts pic. So the connector is outside the vehicle, probably clipped onto the suspension or the body where it goes through the body. Just follow it from the sensor. Unless that's a grommet at the top of the harness in the pic ;>). Your mileage may vary if the dealer sprayed a bunch of aftermarket undercoating.

 

I think Chapman reply above is probably more correct than saying you should NEVER cut or splice ABS. As in the type of signal that travels on those wires isn't that vulnerable to a spliced wire and Chapman had a great suggestion on how to test the problem.

 

PASS. OR DRIVE?

You probably want a small pic set also, to unclip the harness from it's mount points, or at least a pocket screwdriver.

 

When Japanese engineers say to never cut any ABS harness. And there's no reason to, there's always a connector. You can do whatever you want, it's your vehicle.....