Tesla Model S Front HVJB
Overview
The second-generation front HVJB (Tesla p/n: 1028843-01-A & 1028843-01-C) found in the early (2012-2016) Model S, isn't particularly useful on its own, but it does enable a number of other HV accessories as literally plug and play.
Unless otherwise noted, info below was sourced from: https://www.diyelectriccar.com/threads/hacking-the-tesla-model-s-front-junction-box.193729/
Dimensions
Case measurements:
- L : 9 1/4in case (10 3/4 to allow for LV connector and ground connection)
- W: 8 1/4in case (9 1/4 to allow for HV plugs to A/C, DC-DC,etc. and HV in)
- H: 2 3/4in case (3 1/4 if the mounting bracket still fitted)
HV hole size:
- less than 15mm, hard to get actual without disassembly, probably 13-14mm diameter
Connections
HV
There are 4 colour-coded HV plugs found along the top side of the unit (as oriented with the front label right side up) that correspond to particular HV systems. From left to right, they are:
- Grey: Battery Fluid Heater - fused internally at "F1" (20A)
- Blue: DC-DC Converter - fused internally at "F4" (20A)
- Orange: A/C Compressor - fused internally at "F2" (40A)
- Brown: PTC Cabin Heater - - fused internally at "F3" (40A)
LV
The LV connector on the bottom left side is a 12-pin Molex MX150 series (Molex p/n: 33472-1201). Only 6 of the 12 pins are populated, as follows:
| pin | function |
|---|---|
| 4 | 12V |
| 5 | PWM in |
| 6 | STAT out |
| 10 | GND |
| 11 | HVIL in |
| 12 | HVIL out |
