The heater element came on when the rear defrost button was pressed. It looks like it was spliced in near the ‘convenience center’. The auto dimming portion was turned on using the rear view mirror button.
No idea if the doors are pre-wired, but you could check connector C501 at the driver mirror harness and see if the second orange wire (circuit 267) is there on the door feed side:
You must be registered for see images attach
You must be registered for see images attach
You must be registered for see images attach
You must be registered for see images attach
You must be registered for see images attach
You must be registered for see images attach
You must be registered for see images attach
You must be registered for see images attach
Sent from my iPhone using Tapatalk