For awhile i had trouble with my add system and finally today i got under the hood and sure enough found a loose vacuum line. Plugged it back into its home and there goes the green light. This was a huge weight off my shoulders but now i have no excuse to convert to manual hubs. So it was the best and worst day for my 4runner.

 

you can still convert to manual hubs. i think having add and manual hubs is the best of both world. you can have everything unlocked when you know you won't be needing 4wd, and then in situations when 4wd might be helpful (like all winter long). you can leave the hubs locked and the add will take over.

 

Just unplug the line
Ignorance is bliss