Chewed wires : Brake actuator

Replacing the harness is very difficult and labor intensive but is the dealer solution.

Replacing the specific connector far enough back to include the chewed wires is the next option. It takes soldering skills to do it or use of soldered filled butt connectors. This can be tedious and difficult in a tight area and has more potential for a bad connection in the hands of an inexperienced diyer.

Finally, strategic replacement of just the chewed wires using straight solder or solder butt splices sometimes is the easiest but also is the most surgical. If I did this approach I might still get a salvage yard piece of harness (cut off) and use the same wire colors for replacement.

There is no guarantee that other module damage did not occur due to shorts to other wires. However, "most" of the time Toyota's electrical engineers have protected the electronics fairly well.

Overall, I would recommend taking it to an auto electric specialist for this wiring repair. Then to a hybrid independent shop if the wire repair was not enough. Or a good hybrid independent for the whole job.

In terms of wiring repair skills, I like the methods youtube's Pine Hollow Diagnostics uses for soldered wiring repairs. His videos are not specific wiring how to oriented. You will get some advice here to use only the solder butt splices but I think they are best suited for small one or two connections. You are dealing with a life safety system here.