Does anyone know whether the jdm crx climate control will plug in and work without any modification?

 

It won't

 

The reason it won't is because there are a number of things that have to be added to make it work properly.

The climate control needs a temp sensor, so it knows to regulate the air in your car. You also have to add wiring and a solenoid the the heater control, because stock, it is connected to a cable that you operate by turning the ****

 

And a WHOLE lot more, especially if it is LHD