Technically, yes, I think it voids the warranty on any equipment altered or affected by aftermarket components. You'd have to read the fine print on the warranty to get the complete official policy. Unofficially, if it is plug and play then it is pretty easy to unplug and remove before a trip to the dealer. I'd feel unethical about doing that if, for instance, the sat nav started acting up, but if a button broke on the front of the nav unit that had nothing to do with the lockpick and everything to do with bad craftsmanship then I wouldn't have a problem with it.