2nd Gen Tacoma 4.6 V8 1UR-FE and GX powertrain Swap

Can you look up what the voltages are for AC1 on both vehicles? I don't seem to have access to these pin charts in the lexus tech doc that I am using.

 

Not sure, on Mitchell it's under Air Conditioning System>Diagnostics-Introduction>Terminals of ECU.
The Lexus one only shows under 1v with A/C on, it doesn't say what it is with A/C off. Tacoma is 12v with A/C clutch off and below 1v with A/C clutch on.

 

I pulled the door wiring harness off of the GX today. The door lock uses the same plug as the tacoma, I will verify functions and might not need to solder anything on this one.

 

Okay guys, everything on the door lock pins lined up except Key unlock Pin 10 and Key lock pin 9 on the gx460. On the Tacoma pin 9 is unlock and pin 10 is lock. If I understand this correctly, I think the gx system would lock the truck when you tried to unlock it with the key. I switched those two pins around and I think everything should be good. Let me know if I screwed something up.

GX460:



Tacoma:

 

I'm pretty sure the labeling on the Tacoma diagram is incorrect, I'm currently working on a detailed connector pinout chart for the Tacoma and I ran into the discrepancy among others.
As you can see Pin 10 goes to UL3 on the Body ECU, UL3 is labeled (Driver side door key-linked door unlock input) in the Body ECU Pin chart.
Pin 9 goes to L2 which is labeled (Driver side door key-linked door lock input).

 

Okay as far as the windows, it is a total cluster. The Tacoma runs a simple analog system for the window motors. On the tacoma you can just connect 12v to make the window go up and reverse the leads to make it go down. The GX is a digital system with a communication network. The window motors do not just go up and when you connect hot leads, it must recieve the command from the body ecu which comes from the switch. The GX window motors have 7 pins and it is all interconnected into the body ecu. Basically unless you want to totally rewire to an independent analog system, you are using the GX window regulator motors. Luckily for me, the digital motors have the same bolt pattern as the tacoma regulators. I ran out of time today but tomorrow I will bolt in the motor and pop the drivers door regulator in. I am trying to wire up the doors by the end of the week.

 

Hmmm, so do you think I should switch the pins back?

 

Well there is a discrepancy there, if the wiring and pin labels are correct (which I suspect they are) the labels on the switch diagram are swapped.

 

Okay, it would also make sense as to why they are opposite on the gx. I was rather confused why they were opposite on the tacoma. I will switch it back.

 

Worst case your key lock switch would be opposite but yea I'd trust the wiring diagram and pinout before the labeling on the switch.
I've ran into several discrepancies in various charts and diagrams that I had to work through while doing pinouts of harness connectors, still got 18 more system diagrams to work through.

 

This is due to Lexus window design following Japanese cultural cues for sliding doors. The windows open slowly at first, then speed up before slowing down right at the end of their movement. This is supposed to provide the least distraction to the occupants and is similar to the traditional respectful way a sliding door would be opened or closed...or at least that's what I've been told.

 

And having all auto will definitely be a perk. Just making bezels for the switches will kind of suck now. Perhaps someone with a 3D printer could help me out. I will cross that bridge when things get closer to final assembly.

 

These all auto up and down aftermarket switches are fantastic….I don’t know if you can make them work with the GX ecu…but maybe a quick solution…

https://cartrimhome.com/Door-Switch-For-Toyota-Tacoma-2012-2015

 

Wish they were compatible with older tacos

 

Yeah I really wanted one of those but with how intricate the gx system is I don't think it'll be possible. My bet is that switch keeps the analog signal on for your window to go all the way up/down. It is a whole different animal on the gx.

 

My 4Runner's windows are all controlled by the BCM. Stuff like the auto up/down can be overridden and the windows can be controlled with the key fob, or even through the OBDII port. Not surprised the GX is the same. If I'm not mistaken, in the Tacoma, the driver's side switch is the master. If it's disconnected, the other windows won't do anything.

 

Alright, driver door is wired. I carefully took off all the factory wire holders and put them in the correct locations relative to the tacoma door. I mocked it up to look like this. I used the factory bracket for the airbag sensor and welded it to the door. I kinda threw on the door panel and it looks like it will clear in this spot. The rubber door grommet was a TOTAL PITA. There is no way you are sticking those plugs through it. I thought about taking the pins out but I would risk pinning them wrong. There are like 5 of the same color greens on one plug. Additionally I would risk damaging the plugs taking the pins out. I was able to re pin the airbag sensor. Everything else was; cut, strip, solder and heat shrink. The nice thing is the doors are pre wired for courtesy lights. In the furture I can add something to the bottom of the door panel.

 

I got word from Toyota corporate about my complaint for the fire wall insulator. Kentucky warehouse sent it out about 1 week ago. It should be delivered to a local dealer sometime next week. We had a "snow storm" come through. 3 inches of snow and the city shuts down lol.

 

I forgot to update I got the front right door wired up.

As I was working on wiring up the rear left door I realized the door lock has two more pins than the taco so I swapped it over. I checked the wiring diagrams and the additional wires go to the body control module. The Door lock cable needed to be swapped over and the lead ball on the door lock needed to be filed down a bit to fit into the tacoma door latch handle. Aside from that it bolted right in, even the child lock lined up.

The window regulator stumped me for a sec until I realized they used the opposite hand regulator motors on the gx460. See the pics below. All the pins on the rear regulators are the same and I am pretty sure they need to be programmed to use if it's the same as it is on my gx470.
1 left rear tacoma regulator and 1 left rear gx460 regulator pictured below.

 

Back door is wired up, 1 more to go. Window clears the gx lock. Also I had to extend the wires to the window motor.