The only thing close to a motion detector circuit would be the Light sensor photocell in Furby's forehead. I would start on that one and see if it is still functioning. For way more info on the Furby, check [http://www.phobe.com/furby/auto1.html|this site.] It has great information and plenty of autopsy pics. Attached is the diagram for the Furby's electronics. Hope this helps, good luck.
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