Tesla Model S Front HVJB

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Revision as of 23:23, 27 February 2022 by Jason arnold (talk | contribs) (→‎Overview: added part numbers and fuse ratings)
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Tesla front HVJB (shown with HV cable)

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.

Case measurements (as per: https://www.diyelectriccar.com/threads/hacking-the-tesla-model-s-front-junction-box.193729/post-994546):

  • 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. Only 6 of the 12 pins are populated, as follows:

<insert plug pic here>
pin function
4 12V
5 PWM in
6 STAT out
10 GND
11 HVIL in
12 HVIL out