GMC Repair: 2003 yukonxl 2500 6.0l, electrical problems, fuse

Question
Left hand door electrical problems. left door lock not working,left mirror not working, lights for seat heater not working and switch illumination not working on left side

Answer
Hi
I would check the DDM fuse located in the left side panel.
If fuse good, I would HIGHLY suspect the Left door Module (switch).
If possible, you could have it scanned at a good repair shop and see if the module is communicating. If not it is almost certianly the switch.
I hope this helps
PAwl