[Kevin Sharpe]

Further to the work undertaken on the Rear High Voltage Junction Box ("HVJB") by Jeff and Kenny, I've taken a look inside the Front HVJB

The Front HVJB has the following connectors;

"Brown" - HV to PTC Cabin Heater
"Orange" - HV to A/C Compressor
"Blue" - HV to DCDC
"Grey" - HV to Battery Fluid Heater
"Black" - LV signals

The HVJB also has a heavy duty earth strap and two holes for the HV input cables.

 

[Kevin Sharpe]

Removing the cover is easy and reveals the HV connection (power feed from the Rear HVJB), lots orange insulating plastic, and a single PCB

 

[Kevin Sharpe]

A quick look at the PCB reveals four HV fuses and a busy power circuit.

Fuse F1 (20A) connects the HV to the "Grey" connector via three IPB60R099CPA MOSFETs (here) and a .005R WSL2726 resistor (here). I suspect the busy power circuit is controlling the MOSFETs and has no connection with the other fused supplies.

Fuse F2 (40A) connects the HV to the "Orange" connector.

Fuse F3 (40A) connects the HV to the "Brown" connector.

Fuse F4 (20A) connects the HV to the "Blue" connector.

All HV connectors have HVIL pins that are connected to the PCB. The case lid and HV input cables also have detection switches.

 

[Kevin Sharpe]

So would this mean that the PTC heater (water???) be a dumb module? Ah 2013 module looking at some info the battery heater just needs a pwm into the junction box.

Yep... here's the key info