After reading the wiring diagrams for the anti-theft, power door lock, power windows, and keyless entry system, it is inadvisable that you unplug the anti-theft ECU. I believe all operations I have mentioned go through the ECU to work.
The diagnostic in the TSB suggests that you check the anti-theft horn (#4l) and its fuse (#1) in the picture. Here is the caveat. Do this at your own risk. We won't be responsible if any of your systems doesn't work. You may either pull the fuse or unplug the horn wiring harness. That will be safer than unplugging the ECU.
The alarm ECU and its wiring harnesses.
Wednesday, February 4th, 2009 AT 11:24 AM