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Message: <blockquote data-quote="DalN" data-source="post: 2770618" data-attributes="member: 761210">The code you speak of would have to have been setup by you or the previous owner, and I can tell you, it is not an easy thing to do. Most likely nothing will happen if you disconnect the battery.  Also, mostly this problem is only present with factory head units, and I would assume if you are adding a system, you would probably also want an aftermarket head unit.  I haven't been in the car audio business in a while, but a few years back, the factory head units would not be the choice of a good system. You will lose the settings though, like presets, but you can easily reprogram that.</blockquote>