I worked for Toyota for 37yrs and your not going to access the steering ECU with out the whole system. Body control module and engine ECU. There is like 14 control modules on a can bus.See my last post in the Toyota steering thread. The Toyota steering ECU needs to be connected to a scan tool through the OBDII port. There is a "torque sensor zero calibration" procedure that needs to be performed whenever a vehicle is aligned or the steering motor swapped out. This is something that nobody talks about.