HELP!!!! I have a 2007 GMC Sierra 1500 4x4 4 door trk and the door chime is to low. How do you turnip up? Dealer knows nothing nor his main mechanic for over 25 years knows nothing either. I have already contacted GMC. Come talk to Alicia can pushing the number 6 radio button while the ignition is on and the radio is off does not work anybody have any ideas