Hello,
I recently picked up a set of 2011 ISF interior trim for my 2007 IS350. I knew buying them that the window switches would not be plug-and-play because in 2009 they changed the connectors. I was hoping someone could post pictures of the pinouts for the window switch connectors for a 2007 and a 2010 250/350 so I can figure out how to rewire my car for these switches. Or if anyone has done this window switch conversion, feel free to chime in. Thanks in advance.

 

I’m also going to try fitting 09+ switches to my 06, but it’s not going to be easy. From what I’ve gathered from the wiring diagrams, I think you’re also going to need the 09+ window motors at a minimum, and probably the door wiring as well.

 

Please help these guys out with this cause I would love to do the retrofit too

 

I can pull up diagrams for 2013 as I have a subscription at www.alldatdiy.com but someone needs to do the same on TIS. I think its $25 for 2 days of access. Im not certain they have a restriction like my site and any vehicles can be entered. https://techinfo.toyota.com

 

I did some more investigating using the wiring diagrams and put together an Excel file with the pinouts for all the relevant components.

It seems that for 2009+ they moved the logic for the AUTO function from the window switch to the window motor. The switch now only uses the UP/DOWN/AUTO signals to communicate with the motor (2006 used 3 additional pins, PLS1, PLS2 and SSRB for sensing the limit positions). Another major difference is that the 2009+ power window master switch now communicates directly to the window motors via the LIN bus, completely bypassing the other switches. For 2006 cars, the master switch communicated to the other switches using the BEAN bus.
However, on 2006's there's also the PWS pin on the master switch that seems to be connected in the same way to the slave switches as the LIN pin on the 2009 version. I'm not sure what signal gets sent on this pin, maybe someone can probe it and find out.
On the 2006, the LIN equivalent pins on the slave switches seem to be PCT and PCTI, as they're connected the same way to the L/H and R/H junction boxes. In theory, one might be able to replace the window switches and the window motors and reroute the wires previously used by the PCT/PCTI pins to the LIN pins. An additional wire would also be needed from the master switch to the LH window motor for the LIN bus.

By the way, here are some interesting facts about this change:

 

For a second post, that's impressive. Is the new car spec sheet from TIS? I'd like to find this about the A760E transmission. The white paper if you will.

Thanks

 

Yes, it's from TIS. A while ago I paid for 1hr of access on lexus-tech.eu and took as many screenshots as I could, for future reference.
I also have an older IS250 manual saved for offline use, but I couldn't find anything regarding the A760E. However, I did find some info in the GS300/GS430 manual. I can PM you the files if you want.

 

Okay, knowing the source is the key ingredient I'll pay and dig into it on some rainy night. Thanks much...

 

Any updates on this thread? Would the 2009 door wiring harness be needed? Or is it possible to just get the 2009 motors and switches and splice some wiring?

 

Once I saw all the work that was involved, I ended up selling off my 2011 ISF trim and found 2008 ISF trims that were plug-and-play with my car. I did not realize I would need all the window motors and door wiring from a 2009.

 

Can you tell me more about the work? Is it just the motors, switches, and the door wiring harness thats required?

 

Yeah that should be all. I still intend on doing this upgrade, I'm currently gathering all the parts needed. It's hard to find facelift parts in Europe, especially the wiring harnesses, since people usually just cut the wires before the connectors.

 

Just wanted to check in and see if you made any progress finding the parts. I myself have been looking at logic and wiring trying to make sense of it. I think I've found something interesting. Based on the wiring diagrams, it looks like the 2009+ system uses a single LIN bus wire from the master switch, going to all four window motors, and each motor connects directly to its local switch through a simple two wires, Up, and Down. No more SSRB, PLS1, or PLS2, the LIN line seems to handle all of that. From the wiring it looks like each motor contains the logic for interpreting switch behavior (momentary vs. held) and runs the window accordingly. I'm theorizing that you just need to run a LIN wire from the master switch to each motor, and keep the local switches wired directly to their respective motors.

Anyway did you manage to get any of the parts yet? If possible I want to see if running just one wire for the LIN bus would be enough to make the motors work. That would certainly change the parts needed, because at that point you would only need the motors, switches, and a wire to run from the master switch. Below are some pictures of the power window wiring diagrams for the 2009 IS. If you would like the full system I can PM it to you.

 

Staying up into the early morning has my brain on fire. So I dug a little deeper into how the passenger switches interact with the motors and realized that each switch actually has four wires not two (I'm kinda blind): UP, DOWN, LED, and AUTO. At first I wasn’t sure what the AUTO wire did, but after remembering how I did my 2009 Overhead Console swap and how I had to swap in a 2009 Sunroof motor because of different logic, now it’s starting to make sense. The switches themselves don’t seem to be LIN devices, instead, they just send basic signals to the motors, and the motors handle the smart logic internally. My theory is that the AUTO wire appears to get triggered only when the switch is pushed past the detent (the “click” you feel when doing an auto up/down). So the switch just sends “UP + AUTO” or “DOWN + AUTO” when you press past that point, and the motor interprets that as a command to run the window all the way. That means the motors do all the thinking and they read the signals from their local switches. It’s seems like it's actually a really clean system and probably explains why the earlier SSRB/PLS setup got dropped entirely. So far, this seems like decent information, but I'm not that smart when it comes to these diagrams. So if anyone could confirm or touch base on this that would be great.

 

Nope, haven't made any progress yet. I haven't really had the time lately and the parts are hard to find, especially the wiring harnesses as I'd rather not do the wiring myself.

You're right, in the 2009+ system the power window motors also include the basic control system that was previously located in the window switches. On 2006 models, the door switches are tasked with controlling the motor using feedback from the location sense signals (PLS1 & PLS2). They moved this logic into the window motor assy.

I also studied the diagrams in depth, and I discovered that the old switches each have 1 pin (PCT or PCTI) that connects to the same circuit as the LIN bus on the later models. If you follow the wires for the LIN bus, you'll find that they're exactly the same as the wires connected to the PCT and PCTI pins.
The PCT & PCTI pins also don't show up in the system diagram, so they seem to be unused:

So my hypothesis is that they were already thinking of switching to the LIN bus when they were designing the original system. I don't see why you couldn't just use the wire leading to the PCT and PCTI pins for the LIN bus, as they should just work.