2007 1500 front door problem

Hi,

My brother has a 2007 Sierra 1500 SLE Crew cab that has a problem with the front doors locking and unlocking with the factory key fob. When you try to lock or unlock it, only the back seat doors will lock and the front ones won't do anything. The button on the door will work but not with the remote. I tried the resync method found in the owners manual and it wont do anything. Anyone have the same problem?


Thanks