I have a 2002 Silverado 1500HD crewcab and the push button 4x4 stopped working today. The truck is in 2wd and wont shift, which is not real good in Denver right now. The lights for the buttons are not lighting up. I disconnected the battery and checked the fuse for the 4x4 and it did not help. I am going to the Dealer on Monday and would really like to avoind that. Thanks in advance.