How do I find the P/N for a 2005 Isuzu Ascender LS 4.2 driver side window switch?

SOURCE: Window dropped on driver side of my 2002 lincon ls.

Sounds like your window assembly has failed or the cable has broken. An easy repair, once the door panel is removed and the assembly disconnected from door.

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SOURCE: power windows isuzu rodeo 1999

Cable must of disconnected need to take door cover off and reconnect...

SOURCE: Subaru Outback 2005 - Driver side door/window

The switches in Subarus are made by Nissan believe it or not. They are not interchangeable. Anyway, I suspect you have a bad window switch. You can pickup the whole bank of swiches or replace just the one. Do a search on ebay for your part.
Has this car had body damage on the driver's door? You could have a cut wire inside the door.

SOURCE: drivers side window switch not working on 2005

the drivers door switch is most likely bad, they get used the most and wear out first, the connector on the back of switch may have come loose and not making good electrical contact, remove switch and check connector and if still not working need new switch, the windows are all on same circuit and either all work or none work so not fuse. extremely rare is a short in wired but not likely.

SOURCE: 2005 Chrysler Town & Country. Passenger side window problem.

HAVEK 1005 sounds right on track.... but also try this, usually works well for non functional power windows, specially Caravans.

NO COST PROCEDURE TO FIX IT:

1. Sit in vehicle, on seat next to problematic window
2. Ignition key is on
3. Door in question is opened (in case you closed it)
4. While door is open, press and hold power window button in desired window travel, keep button pressed !!
5. SLAM hard the door closed with one hand while other hand holds button as per #4.
6. Watch window operate as it should.
7. Repeat 3-6 if necessary, but usually the first try works!

NOW, for the naysayers that says you must replace power window motors etc, at $$$ cost because the above fix does not work, or is not long lasting fix, or less than a "professional fix".... Well then, when the window fails to operate again, apply same fix again at that time.

I have fixed my van this way numerous times (usually once a year), and to all local friends I recommend this fix too, likewise do the same and are happy with the solution.