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As someone on avic411.com said: "you need the mute wire to complete the bypass... the parking brake only makes the unit think the brake is up to unlock it...the mute wire stops it from knowing your in motion. so if you didnt ground the mute wire (obviously after moving it to its correct spot) then it would be unlocked and as soon as u started moving your unit would say "hey wait a minute!!" and lock you out."
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