Martin,

Very likely it could, at the very least it could help somewhat, the one I bought is the Xtool D8S which I found for around $100 more than the D7, normally it's about $200 more, but I was going to get the D7 until I saw the CarCareNut had compared them both and the D8 was a little better, but they both can do almost the same tasks, he said the D7 was the best DIY scanner and close to a professional level scanner for a third of the cost, the D8 he said was as good as most all the professional scanners other than the $5000 Snap-on scanner, and both are as fast or faster than the Toyota OEM scanner, I really need to also get a OEM Toyota shop manual because this scanner can do all the Toyota scanner can do but for some of the tests you need to follow steps in the manual.

With a Bi-directional scanner you can test various components individually, for an example, say your driver's window stops working, you can send a signal directly to the motor bypassing the switch, if the window responds, then you know it's the switch that is faulty, basically you should be able to test various components, computers, etc. I'm also having issues with my AC so I'm hopely the scanner will help me pinpoint the part that has failed.