Sounds like a bad unit. I put a 99 GPGT Cd player in my TGP long ago, i had to slot the dash bezel, so it could move forward, same with the controls for the HVAC, You just break up the connector from the TGP it fits just fine in the newer CD player. I also had to remove the little factory amplifier from the loop, and running all four front speakers off one chanell, and the rears off the other, and it worked perfect. I could fade front and back left and right, equalizer worked good, no buzing or noise. I have had shitty factory decks have their internal amplifier go bad and make the buzzing noise. I made mine look damn good. The factory antena should work fine, but if not, just figure out which wire it is, and then use a splice lock to just qucikly connect the ACC power to the power antenna. Works great