I was looking into why I did not have any door/headlight chimes/alarms and I think I figured it out. Is the door chime of the 05 Trailblazer supposed to play through the door speakers? I have a PAC module (came with the TB) for OnStar retention and it has an adjustable pot for setting a 'volume', but since I run RCAs from my headunit to the amp and the speakers run directly to the amp, I don't think the PAC module is fully functional since it isn't connected to speakers. Yes? No?