I know this is a common problem on the SC430s and would like to take a shot at fixing it on my 2002. So far these are the things I've narrowed down to as the problem:
1. Switch - glows green (seems ok) but I ordered another switch on eBay just in case that was confirmed working. Both only work intermittently so I don't think it's this.
2. Motor - the door opens smoothly when it works.
3. Control unit - my thought is it's probably this.
Does anyone know if you can order the control unit that sits on top of the Mark Levinson receiver? I saw one on eBay I could purchase as well. The door seems like it's running smoothly (not out of alignment) and works maybe 1 every 20 times I click the button. Thanks!
Edited to add: I found the part number on MyLParts.com it's 55406-24010 and the cost is $1,068.23. I think I will stick with eBay