The PNP switch replacement is a bit of a pain. A bunch of stuff has to be moved out of the way and then once it's in place you have to "adjust" or as they call it, align it. This is really not that hard though...much easier than trying to get an alignment tool. So, most people do it without the tool. The PNP switch has to be aligned within 3mm of what it's suppose to be for it to work at all so if you get it in and it doesn't work, don't assume that the switch is bad...it's probably the alignment.
Here is the write-up from Volvospeed regarding the PNP replacement that will help you step by step (minus the added notes that you'll find necessary for alignment without the tool that I make below): http://volvospeed.com/Repair/pnpswitch.php
If you're doing the alignment alone, put a mirror behind the car such that you can see the reverse lights go on and off from where you're working. Put the car in reverse (car on, engine not running) and turn the large metal part of the PNP switch forward and backward until you can get the reverse lights to go on and off in both directions. Mark the location with a pencil where it goes on, then rotate more until the reverse lights go out, mark with a pencil. Now move the sensor so that it is between your two marks (reverse lights should be on) and tighten down. The adjustment is done. Turn the key off, put the gear selector back in PARK and button it up.
Good luck to everyone trying this. Let us know how it goes by adding your comments!
