A close look to the Preset's PCB (insulated) and the push button Removing the preinstalled main unit The main unit includes all the electronics for controling the A/C. Therefore we have to keep it inside the car. If you remove it then you will have the A/C working at all times!!!It is very simple to remove this unit. It is mounted with 4 screws, 2 on top, 2 on bottom,left and right. When you unmount it, keep in mind that you have to disconnect 3 harnesses (1 for power black, 1 for the speakers brown and 1 for data,cd changer /yellow/green/blue/) from the back of this unit and also the aerial connector. You now have in your hands a 2 DIN sized metal box which is mostly empty!!!! Inside you can find one PCB and the mechanism for the casette deck. Unmounting the main unit's PCB Since we have to keep this PCB we have to put it in a smaller box. First let's unmount the main unit. You need 2 kinds of star edged screwdrivers (the one is the same you used before to unfasten the console's screws). Remove all screws. The top and bottom covers are easily removed since they are not fastened with any screws. Just lift them up and they will be removed. The front part of the metal box can also be removed but you have to unfasten the casette's mechanism first. 4 screws at the bottom of the PCB hold it in place. before that disconnect the mechanism from the PCB. There are two connectors, a multicolored ribbon cable for power and a PCB-like one for the heads. Once the mechanism is removed the front faceplate will also come loose and can be removed. Gently slide the PCB from this opening and it will come out. You have to open the sides a little to come out completely. As you look at it with the red connector on your left side you can see the power amplifier with its heatsink on the upper left just before the 3 harnesses. There is a small metal plate that is loose there, be carefull not to lose it. Moving the PCB to a smaller metal box You need to find a small metal box about 1 DIN size, even smaller. I used one from chocolates This is the box i usedUsing a pair of scissors for cutting metal i formed the above box in order to fit the PCB in it. The depth should not exceed the main unit's depth and the width should also go with this rule. About the height just do not exceed 1 DIN!!! I also formed the cover of it to fit the rest of the box and also removed some pieces since the heatsink was taller than the height of the box. A small hint: Do not form a fourth side on the box, the front side. Since the connector for the ribbon cable has to be visible, it is better to leave this side uncovered. You have to mount the PCB on the box.Take a good look at it. You can find at least 3-4 places to mount it with a screw. There are holes in various places, just pick 3 or 4 of them. They are enough. Put the PCB in the metal box and make it go as left and as back as it can. Mark the places of the harnesses and the aerial. Cut the metal bot in order for them to protrude when you mount the PCB securely into the box. Put the PCB back again and mark places for the screws on the box. Also mark on the box the holes for the 2 screws that hold the power amplifier and one that is on the aerial (there are 2 there but 1 is ok). To insulate the PCB from the metal plate I used plastic spacers and i also covered the bottom of the box with a dual insulation of cardboard. Make holes on the cardboard also. It is easier when you mount the PCB on the box. Put the PCB on the box and mount it using the 4 mounting points you just made, the two screws of the power amplifier and the aerial screw.