Hey I started my LED changeover, looked through your thread and saw yours was all done and you did it yourself.
Do you have any pictures or documents saying which soldering joints are the + in the steering wheel buttons, window switches and seat heaters, I used Scottyboy's one picture for the Digital HVAC but couldn't find anymore like it from the searching I did.
I'm ordering a multimeter but it won't be here until sometime next week and I don't want to wait. I'm taking pictures of all mine as I go along so it's easier for others to attempt.