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Hacking the Tesla Model S Front Junction Box

26K views 41 replies 12 participants last post by  Anatolii Efimtchik 
To avoid going too much off topic in the Tesla Battery Heater topic (which of course is related), I have a question about the FHVJB.

What are the dimensions of the box?
(length/width/height) and size of the holes for the incoming power cable.
That allows me to create a dummy and explore possible locations in my car while looking for a FHVJB myself.

And is the corresponding plug for the control connector known?
Edit: sorry, see it mentioned above: Molex 33472-1201
 
Another question on dimensions (did not get my hands on a box myself).

What is the outer diameter of the cable going into the HVJB?

So the orange cable that has been cut shown on this photo by Kevin.
Orange Technology Electronic device Automotive lighting Electrical supply


Then I know what gland to use on the other side and design/draw the appropriate hole in my battery box.
Thanks in advance!
 
Finally I've found my FHVJB! I also have a Tesla service manual.
Now the question is, how to use the FHVJB to PWM control the heater?
Unfortunately 1 and ! isn't 2 for me at this stage.
Building on the connector X040 info Kevin shared earlier I'd been expecting 4 wires in the connector. In the box I see 6.
Connector numbering/layout
6/5/4/3/2/1
12/11/10/9/8/7
Then I see:
6 = White
5 = Yellow
4 = Red
12 = Blue
11 = Green
10 = Black
Electronics Electronic engineering Electronic component Technology Electrical wiring

Unfortunately besides the HVIL and Thermal controller I cannot find any reference in the wiring diagram that could help me in understanding what is what.
Has anyone already figured this out? Or a suggestion how I could approach this?
 
Thanks!
On scribd I found an newer version of the Tesla service manuals and those made more sense. I could trace your list back and came to the same conclusion. I think I'm staring to understand things ;) Should have gotten that manual much earlier.

I have measured and can conform the pins 11 and 12 as the HVIL lines.

And answers do trigger new questions:
- Can we do anything with pin 6 (STAT out (PWM))? Curious what kind of signal it will give.
- What are the characteristics of PWM in (pin 5)? Is that just a matter of assuming it's 12V (should be logic in a car) and try different frequencies?
 
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