use the amp turn on (blue/white) to trigger a relay that grounds the green wire on the pioneer. it provides enough delay to reset it everytime without having to use a toggle switch.:D also concept has an oem line that has nav bluetooth steering wheel controls and requires no dash kit. looks like...
direct replacement. 2 min swap. double din aftermarket however is not a drop in on a 99-04. those radios r din width but a lil short. i have done em but they require some trimming.