[talkingcars]

With the auto switch you push down to go down, push a bit hrder and there is a click which activates the auto function.

I got a spare out of a late 400 which fits and works in my early 180.

I guess the non auto switch plugs into the loom as it comes into the door where as the auto switch plugs in to the auto control unit which plugs into the door loom.