I thought we better have a dedicated thread for this gizmo. Any questions about it on here please.
The BCM interceptor intercepts and modifies serial data signals being sent from the BCM to the MCM
on the RS485 BATTSCI line in a G1 Insight.
It's primary function is to eliminate the OEM Gauge/BCM Soc charge issues when using larger battery packs.
It does this by faking 19 bars SOC allowing full vehicle function for an unlimited duration.
It can also be controlled by an external device and can manage over/under voltage and over temperature situations
preventing the car (MCM) from charging or discharging the battery when this would result in damage or danger.
The code is open source and can be modified to provide even more control/functions as users require.
I have been doing some more testing on my recently arrived pcb and have fined tuned one resistor value and made a small change to the interceptor code. Resistors R1 to R5 are now all 1k.
Please use the code/pics/schematic from this post/thread when building the device.
Below some text copied from my earlier post.
The Mini BCM Interceptor can be used by people who don't want the full combined pcb and who have there own BMS/FOOLER/CHARGER CONTROLLER ETC
The blank pcb is about 50x50mm and costs $49 inc P&P Paypal to my usual sig address.
I think it's pretty self explanatory and is controlled by simple logic high low on the J3 Inputs.
It also has a serial data input so could receive commands from another device.
Logic High on the Over V input = Regen disabled and SOC set to 20 bars.
Logic High on the Under V input = Assist disabled and SOC set to 0 bars. (Ima start is disabled) (Forced charge activates)
Logic High on both inputs = (Over temperature) Assist and Regen disabled and SOC set to 4 bars.
Normally both should be pulled low to Gnd by an external circuit or jumper wire as shown in my picture.
Both inputs pulled low results in 19bars Soc and full Assist/Regen functionality.
That's how I use it in both my Lithium cars as currently my BMS does not interact with the BCM Interceptor.
Note. It does interact with the Lifebatt BMS in the Insight Rally car, which had a logic output for Over/Under V or T
and simply activated the Interceptor protection when the BMS signalled a problem.
Components all through hole. Same/similar to ones on OBDIIC&C and BCMGauge parts list etc.
I'll knock up a google parts list spreadsheet shortly.
The 5v power for the Interceptor is sourced from the MCM by splicing into
MCM Connector C Pin 24 Grn/Wht (+5V)
MCM Connector B Pin 25 Red/Yel (Ground)
The BCM Connector A is best used to locate the orange and white BATTSCI wires reqd.
BCM Connector A Pin 7 (White) BATTSCI
BCM Connector A Pin 20 (Orange) BATTSCI
You will need to cut and extend the ends of the wires so they can reach the pcb.
mount the pcb near the high current/voltage orange power cables.
I suggest mount it where I did on top of the MCM or BCM in the gap in the foam packing.
You could install it inside the MCM or BCM by cutting/modifying the appropriate pcb pin connections.
The wires comming from the BCM goto J4
The wires going to the MCM goto J5
Nice and easy 6 wires in all for a basic install.