I have built an Arduino-based CAN bridge (see details below), and collected logs from the car and EV CAN buses. Clearly, there has to be something different about the messages coming from the battery, and I suspect 1472 (5C0).
I contacted Dala, and he suggested that it could probably work, and that I should make a post here to ask for advice. Before diving into details, my current status is:
* The CAN bridge works (I do drop messages occasionally, but the EV CAN seems robust to it)
* I'm playing with different manipulations of the message (see the code below)
* I've found that if I power-cycle the Leaf (press the on button three times, fairly quickly), then the OBC will shut off
* When turning off the car normally, sometimes the OBC runs for a few seconds and then shuts off... but often it doesn't, or actually starts back up several hours later
* When plugged in to charge, the OBC pretty much always seems to stay on afterwards
* If I interrupt the message flow, the OBC shuts off (maybe this suggests a crude alternative method: monitor the charge state, and then briefly interrupt the message stream once fully charged to trigger shutdown)
My main questions:
* Does this seem doable? Or is there some fundamental wiring harness issue that I don't know about?
* What message bits do I need to manipulate and in what ways!?
Message details (5c0):
Here are *all* the unique 5c0 messages (for the mux value for minimum) from Dala's log file (https://raw.githubusercontent.com/dalat ... hstock.log), compared with some random other person's I found, compared with one of mine.
Code: Select all
XX – mux (min/max/avg) X - Heat start mail send request X - Heat stop mail send request XXXX - HistData_HighLow_Volt_Tim XXXXXXX - HistData_Temp_WakeupPhase X - Batt Heater mail send request (???) XXXXXXX - HistData_Temperature ? XXXXXXXX - HistData_IntegratedCurrent XXXXXXX - HistData_Degradation_IR X - Heat Exist (if equipped with heater) XXXXXX - HistData_Cell_Voltage ?? ??? XXXXX - NextWakeupTimeForHeater XXXXXXXX - DiagTroubleCode 0x40 60 60 00 c9 10 04 0c 01000000 01100000 01100000 00000000 11001001 00010000 00000100 00001100 0x40 60 60 00 c9 10 04 0f 01000000 01100000 01100000 00000000 11001001 00010000 00000100 00001111 0x40 60 60 ff c9 10 04 0c 01000000 01100000 01100000 11111111 11001001 00010000 00000100 00001100 0x40 60 60 ff c9 10 04 0f 01000000 01100000 01100000 11111111 11001001 00010000 00000100 00001111 My message: 01000000 01111000 01111000 00000000 01000010 00001000 00000000 00000000 Random person’s message: 01000000 01011010 01011010 00000000 01110101 00000100 00001100 00000011
CAN Bridge Details:
- Due to chip shortages, I wasn't able to find a cheap board with 2 CAN ports, so I use 2x CANBed's ($20 each), and bridged their serial lines
- https://github.com/thandal/leaf_can_mit ... _relay.ino