Since you talk about locking, I guess you are talking about a touch screen thermostat. When you press the "System" key on this thermostat, five touch keys appear between the "Cancel" key and the "Done" key at the lower center of the screen.
2000 F150 Power Issue. Changed starter, solenoid, now when i connect the battery (+) the starter engages. Is it a fusible link issue? I van take cabke off, touch it to the +, and it cranks.