[2007dctundra4x4]

the bypass is so you can watch dvd and use nav while in motion...otherwise alot of the functions go away...i have a kenwood dnx7100...very easy to bypass, just ground a wire....best buy here sells the avic d3 for $1000.00...not sure what you paid, but you can get online for 600.00 or crutchfield offers a package with the d3, bluetooth, ipod, harness and dash kit for 800.00...just thought i'd help you save some cash...anyway the bypass module i believe is some sort of speed sensor thing for pioneer