Well, I have the wiring diagram in front of me here and I'm not sure how to post all the info that is there. Am I permitted to post the copy of this one page from my service manual??? I'm thinking that may not be right.
From what I can tell, the left and right up/down/left/right have different color wires. The heat wires for left and right appear to be both Black/Light Green(-, pin5) and Light Blue/Yellow(+, pin 4).
The mirror motors are a bit more tricky:
Left:
Yellow is up/down (pin 1 in diagram)
Dark Blue/White is left/right (pin 2 in diagram)
Yellow/Pink is common for up/down/left/right (pin 3 in diagram)
From the schematic, it appears that...
Yellow(1)- and Yellow/Pink(3)+ moves mirror down
Yellow(1)+ and Yellow/Pink(3)- moves mirror up
Dark Blue/White(2)- and Yellow/Pink(3)+ moves mirror right
Dark Blue/White(2)+ and Yellow/Pink(3)- moves mirror left
Right:
Yellow/Black is up/down (pin 1 in diagram)
Dark Blue is left/right (pin 2 in diagram)
White is common for up/down/left/right (pin 3 in diagram)
From the schematic, it appears that...
Yellow/Black(1)- and White(3)+ moves mirror down
Yellow/Black(1)+ and White(3)- moves mirror up
Dark Blue(2)- and White(3)+ moves mirror right
Dark Blue(2)+ and White(3)- moves mirror left
Hope this is understandable and can help you out. I'm thinking of doing the tow mirror swap in the near future too.
-Deon