Owners may want to disable this in hardware rather than relying on a sketchy opt-out mechanism. The relevant part is the "data communications module". It has an LTE modem and a backup battery, so it's able to transmit even if the car battery is disconnected. It requires a little bit of dashboard disassembly to access. You can either remove it or disconnect the LTE and GPS antennas. Toyota has technical documents available for $25 at https://techinfo.toyota.com.
It would be great if there was some website that collected all the detailed instructions for removing the spy devices from different car models.
It would be great if there was some website that collected all the detailed instructions for removing the spy devices from different car models.