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Hello... Lets see what we can get figured out. So you are trying to install a radio from another model on your vehicle. Does the original harness snap right in or are you using an aftermarket harness?
Okay so if it helps I can provide the wire location on your factory harness for the volume control and I can also check to see if I can locate were on the FJ cruiser radio those wires need to be hooked up too...
You think this may help?
You would Prefer to have a live phone conversation?
Okay... Give me a few to take a peek at the wiring diagrams. As soon as I get organized I will message you back.
Does your vehicle have an amplifier? Also is your vehicle equipped with a rear audio system. Basically do the rear seats have control of your audio as well?
Looking at the Wiring diagrams for both I don't think that this will be easily rewired if possible. What I can do is provide you with is the wiring diagrams or maybe another expert to see if maybe they will be more useful? I apologize for the wait.