New Headunit install has a static noise

[Shae]

Hi, new to the fourm here. I installed a new headunit in my dads truck. His truck is a 2005 Chevy Silverado with the bose sound system with factory sub. everything works great other than we have a static noise coming out of the speakers even when there is no audio playing. it goes away once you mute the headunit. We chose the Alpine ILX-W650 which is connected with the PAC RP5 GM11 to retain the steering wheel controls and onstar. Like i said it all works but we just have that static and i dont know what to do. If anyone can help me, it'd be much appreciated. Thanks in advance!