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Heres the old climate controll switch wire. We are going to need to tap a wire into this blue/yellow wire to the one previously mentioned in order for the rear defroster to work. The other wires you can just leave alone. - Heres the old defroster switch wire. We are going to need to tap a wire into this blue/yellow wire to the one previously mentioned in order for the rear defroster to work. The other wires you can just leave alone.