My module came in yesterday. The listing noted it as a DC/DC converter, though it is for certain that CCS interface module. For the sake of clarity, the manuals note it being "Generic Function Module 2" as there is another Generic Function Module that is tied to the charging port itself - managing the ring mostly. The module has a label calling it "EVCC" so I'll probably adopt that as a name.
It has one HV connector that goes "to the battery" and another that says it goes to "ISC", which really is just connecting to the TCM area of the HV DC harness. The last HV connector goes to the fat pins of the CCS port and there are 2 harness connectors that carry CANBus, power, etc in and out of the module. It interfaces with the original GFM to pass PLC/Pilot, control the port interlock, etc.
I opened it up and found a MC9S12XEP100 based board made by Delta (likely the whole EVCC http://www.evat.or.th/attachments/view/ ... _id=216475
). Under that is the good stuff. The ISC and Battery connections are hard bussed together, so even if the thing is totally dead, the rest of the system would be able to operate normally. The charger pins are run through HV contactors which are controlled by the board above. This is effectively the same arrangement as the CHAdeMO hack - a tap into the HVDC bus where external charger current can be connected via contactors.
There are still some open questions about how this will work. Since my GFM is the original J1772 version, it will almost certainly not be able to respond correctly to commands sent by the EVCC. If I can find one I might put it to use, but in the meantime I have a new Arduino Due that could be a gateway to the GFM - intercepting commands it wouldn't otherwise understand and reply on it's behalf with correct data. This Due would probably operate the interlock circuit on the CCS port I install.
Other than that, there's just the potential that this will simply be unable to work with the other components in my older car - but there is the distinct possibility that it could be a nearly seamless drop in. Only time will tell at this point. Should it be the former, I may still be able to use this hardware in a more isolated way, using the Due to make it think the rest of the car is playing along and have it operate while the car is started, like the current CHAdeMO hardware.