When off-road VSC can get you stuck in mud and san (in 2 wheel drive) because it has a throttle reduction built into the program. So, it will slow you down, then you have to put it in 4 wheel in places you normally wouldn't have to. Here is a good explanation of the toyota VSC, A-TRAC, and lockers: http://www.fjcruiserforums.com/forums/how-technical-articles/64014-... . For the A-TRAC switch, its not an interrupt. My FJ did not have the A-TRAC switch, so I put it in (works great). I also have an accessory bypass switch that allows the radio and CB to be used with the vehicle off. Just flip the switch and they both have power. Hope this helps.
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