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Discussion Starter · #1 · (Edited)
Here is a 4-cell CMU (Cell Monitoring Unit) board showing some of the components:




And here is a diagram of the power supply(s):



And the CAN Buss and Autonumbering Daisy-Chain circuits:



And thanks to Mário Fernandes in Portugal, we have the internal daisy-chain wiring harness:

 

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Discussion Starter · #3 ·
Here is the lower 256-words of the eeprom, the upper 256 are identical. This 4-cell CMU was in a pack in location "6", known as CM06. The first word seems to be the board ID #. Wrote an Arduino sketch to read the chip with a MicrowireEEPROM library from timos on github.
 

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Here is the lower 256-words of the eeprom, the upper 256 are identical. This 4-cell CMU was in a pack in location "6", known as CM06. The first word seems to be the board ID #. Wrote an Arduino sketch to read the chip with a MicrowireEEPROM library from timos on github.
Do you know what any of these numbers mean? Is one of them capacity?
 

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Discussion Starter · #5 · (Edited)
Never got too far in decoding the other fields.

i think either the BMU or the EV-ECU stores the value for number of cells and the capacity, but its been awhile since i pulled those data items.

PID 374 byte 7 is Battery Capacity according the the list from CZeroOwner, the author of the CZero app. ref: Re: Decyphering iMiEV and iON CAR-CAN message data
 
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