I have a hard time believing that it is as easy as replacing the HVAC control unit. For one thing, the Sienna Limited HVAC control ties into the 3.5 inch display at center top of the dashboard which shows which mode the HVAC is in. Does your LE do that. I would guess that this change would require sensors, one or more ECU"s and some wiring changes. And what about the HVAC control for the rear passengers? Aren't the ones on the LE and Limited different?