First thanks for everyone for taking the time to post you findings, finding time to post here is the most difficult thing to do for me.
I thought I'd take the time to chime in, I can continue to elaborate once I actually get my switches, I currently only have these handle lights purchased here:
I should start by saying I drive a 2020 RAV4 Hybrid Limited but you can take these findings and guess as to what Toyota has done to cheap out on given your specific trim and what is currently installed in your door panel.
I don't think it's made very clear in the previous posts but the key to do mod and have the lights perform as they are stock what you are looking for is the dimmer negative and ANY positive wire to tap into. This negative wire will dictate when the lights turn on and any 12V source will do, you have many accessory driven 12V in that door panel to choose from. Instead of telling you which pins I am going to tell you what to look for with your multimeter to know if you have a dimmer wire available to you.
1. Stick your multimeter on a known ground (door hinge is what I use) and find a 12V source by probing the connector pins (switch can be unplugged). There's quite a few and they are likely all accessory driven on this harness so which one you use only matters from a load standpoint and these are tiny LEDs that have practically no load.
2. Next, stick your red lead in that 12V source and probe for your dimmer ground. Setting your dimmer switch to low should net you something like 2-3V and all the way bright will net you whatever your battery voltage is reading 12-14V.
Obviously this probing should be done with the lights on so the dimmer switch is providing some amount of continuity for that ground wire.
All of that said what I had to do given each door was this:
1. Front left door, repin the t-harness I received as it was wired I think for a car with folding mirrors, none of the pins were correct, I found the two I needed, depinned it, and moved things around.
2. Front right door is still an unknown, there is no dimmer wire I could find, it shouldn't be too hard to run one from under the glove box, I spent maybe 10 minutes probing down there and had to stop for the evening
3. Rear left and right, since my car has an illuminated heated seat button I tapped into that as the window switch connector did not have a dimmer wire, I cannibalized the t-harness leads and made my own t-harness for the heater button.
PRO TIP:
If you don't want to use vampire clips or splice into your existing harness build a T-Harness with leads and shrink tube and just tape the wires to the connector. I'll post a picture of this when I get back in there to install resistor today, it's a way cleaner/safer/reversible way to accomplish what you are after.
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