I'll get some pics up later tomorrow. Got back on-line at home after dark. Sorry.
Ebay usually has a few listed. This dealer is parting out one that may still have it, "ttruckcenter".
Here it is, $1 no bids, closed,
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=33626&item=7906254840&rd=1&ssPageName=WDVW, searched under 'vitara pump'.
It's actually a pressure pump, and not a vacuum pump, that's how I found out the pin hole with bubbles.
As for a switch, I'm thinking yes on the shifter, which shows 4wd, then the pump is activated by a relay.
Pump has a circuit breaker as after I pulled the broken hose off, it kept pumping. Then totally stopped. Couldn't find the fuse box (suppose to be in engine bay), but there are several breakers on right fender. Turned off the key, replaced the hose, and hoped pump would come back on. 4WD indicator showed and I heard a faint brrr. Tested the pump by pulling the hose and it was working......Yah.