My wifes 2006 envoy driver side door switches quite working. All the other doors work fine. When you turn the key off the radio used to keep playing not any more. The dome light does not work. The controls for the mirriors does not work. The locks and windows all dont work. But on the other doors they work fine. The dealer told me that I could not just change the switches. Because that the new switch would have to be programed to control the mirriors. Any help on this matter would be great. Nobody has been able to tell exactly what is wrong.

Welcome to AF, correct no one has been able to tell what is wrong without some in depth onsite diagnosis. Just changing the switches is not the answer, there are modules and the BCM in the control circuits here that must be checked and/or scanned, no other way short of " shotgun" parts replacements.