I just did this install on my 08 gxp and everything sounds good and works fine regarding the jack and xm. My only issue is now half of the display on the radio is dim. I unhooked the xm plug and tried again, but the light is still dim. Do you think this is related to the install, or is it one of the bulbs inside the radio got jarred or something during r&r? I've had this car less than a week and prior to this install the radio light worked.