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Hi quick question for everyone. I have a 2011 Honda Fit Sport and I want to replace the factory radio with a new one. I have a wire harness for the standard main plug in and for the antenna. However, there is a third small gray plug at the bottom of the old radio that I have no clue what it is for. If anyone knows what it's for or if it needs to be hocked up to my new radio please let me know.
