well generally most electric 4 wheel trucks have the control panel in the rear behind a cover plate but in toyotas case i'm pretty sure it will be behind an access panel on the lefthand side. The steering motor may be mounted under the floorplate area but in some cases i have seen it mounted underneath the battery area which in that case the battey would have to be removed.

But judging by the way you replied if you are not sure then i am going to assume you are either an operator or an owner and not a technician being that you had to ask. If i am correct in my assumption then i would call a qualified electric tech and have them check this. Safety is your foremost concern and i would hate to see someone get shocked or hurt in any way or even cause more damage to the truck because of their uncertainty while working on one of these trucks.