To be in the zone and focused on a task or during an event. People put in stressful situation who are rolling with the punches and not getting hung up on things are switched on. First responders, military personel and those who deal with dangerous and stressful situations are known to become "switched on" when faced with an event.
"This looks like a prettybad car accident, get switched on."
Switched on can mean to be in love. It is used to describe the feeling someone feels when they are infatuated or turned on, it is another form of turned on. I guess it is not really in love but it can be used in a different sense than turned on.
Woman you have me switched on, why don't you let me pick you up at your place tonight?
A door wall is a sliding-glass door or patio door. The term is yet another example of banal Michigan vernacular, where in the residents latch on to company names, trademark names, marketing terms and product names from local companies. The terms become embedded in the local vocabulary and eventually become accepted as actual valid words and phrases. In this case the term comes from Wallside Windows in Taylor, MI (a large window manufacturer), where 'door wall' is their created word for sliding-glass door.
"Bob! John's gonna bring over them doorwalls from Wallsides on Tuesdee afternoon 'round two-thirty. Get 'er done!"