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Discussion Starter #1
This is a progress thread, and a prelude to a How To.

Quite Simple, I have a driver and passenger side 2000 300M seats, and a 2000 BCM from a 300M.

To have the heat and memory work, it requires the BCM. I am building my own wiring harness and making this a clean install. As Far as I know, I will once completed be the first to install and have fully functioning Heat and Memory 300M seats in a First Gen. Ross (TFC) has done this before (In his Minivan) and has helped me greatly. I just made some refinements to how I set it up to cut down on space required.

Some Pictures..

The pins used for Heat and Memory.


Two grounds on outer sides (Black), a Fused 12 volt constant power source (Red), and a Ignition source (Grey).(tells the BCM the car is on, kinda like a remote wire lead)


The one wire on the side (some BCM have these on the top) is the PCI BUS wire for the heat/Memory that connects to the Under the Seat module.








I siliconed it to prevent debris, and the hope to god spill incident from ever effecting it. It looks nasty right now cause it is still wet. It honestly looked better in my mind than it turned out to be.

I would also imagine, at this point you can leave the RKE unit on, and have it set up to start or do something. I am leaving it out cause I don't wanna mess with it. (So anyone need a 2000 RKE Module I got one)

More Wiring


From This-

^Lexus Engine wiring harness (part or it)

To This





 

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Discussion Starter #3 (Edited)
Well, I am officially dumping this project.

I have back traced, checked, re check everything and the seats and memory still do not work. I have tried a second BCM.

Before, Everything lit up and seats would say either Hi on Lo, but had no heat or memory, now, driver side lights up but heat does not show (the light) but the passenger side light does (shows Hi or Lo) does. Still no heat of memory.



I am postponing this til I get the motivation to **** with it again. I live in florida so its not like I need them. It was just something I wanted.
 

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Discussion Starter #6
For proper function yes, However one could just supply a switchable 5v source to the seats with a heat sensitive sensor that will cut the power off at a predetermine temperature. How you would do this, no clue.

I haven't revisited this project lately. been to busy with more important stuff on the car.


However, I do have the wiring stuff and more photos if you need them.
 

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im making new harness to wire up both seats till i get my bcm and my wires are not matching up to the 04 300m diagram i got.... lol so what now...
 

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i have one wire that i dont know where it should go
gy/lb....


but all 7 from are done.. so i guessing its done just run the bcm
 

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Wha?

If you are just measuring power at the plug with a meter, and the meter is measuring from the wire to a good ground source, then you have a power source problem. If you DO have power at the plug, but the seat isn't reacting, you have possibly a seat based issue, and possibly a ground issue.

Beyond that, I don't follow your question.
 

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I vhave power to the seats..... don't have power to the bcm... don't have a meter tester... just a lead to see if I have power.. ignition has power once truck is running... so that is my best guess is the ground..
 

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Discussion Starter #19
Ok I got power to everthing and the heated switch does not light up....
Do you have the Bus wire wired up? I believe purple/blue colored one. I know mine would light up, but my Memory and Heat would not work. And at that time 90 degree Florida weather made me stop worrying about it.
 

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I have vt/yl going under the seat.... Ill have to look vt/bl is not tide to anything.... Will have to look in the moring
 
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