This is my first post and I have a mess with my 2003 SE. I bought the car off the internet and have encountered the following problems. The entire Radio/Heater controls was stolen out of my car. Whoever had it before me installed a 2002 unit and everything worked except the steering wheel controls and the heat. The only thing the unit would do is blow out extremely cold air. After finally gettin Nissan to tell me what the car was suppose to come with I got the part off of Ebay. The car came with Navigation and the HVAC controls are part of the Navigation Screen. I put the unit in myself and rewired two wires that the person before me cut. Everything works now as far as the radio / steering wheel controls, but now the HVAC controls will not come on at all. I checked the small fuse box but none are blown - does anyone have any help they can offer. Thanks for any help you can give me.....