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This is kind of a hard question to answer, but I see what your asking. This could be that the entire radio panel is attached (physically) to the heater control, or a wire is shared with the heater from the radio. Some automakers tap into existing wire for other components to have less wire running around. For instance, the 12volt accessory wire (usually straight red) comes from the ignition. Is it a good idea to have 20 or so wires coming off the ignition just to run items that are only used when the vehicle is on? Same principal follows with housing electrical. If you had a fuse for ever electrical outlet, then you would have a very big fuse panel in your house.
Check to see that you haven't forgotten to attach something, or that something is cut. Also, you may want to look for the fuse/relay for the heater and check that. Adding an aftermarket radio could throw a short out in the panel resulting in a blown fuse to protect other components.
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