[rndbit]

Hello, I'm new to this forum and hope you can guide me in my first electrical conversion.

I have encountered my first problem regarding bmw i3 battery and simpbms and have tried to solve this for a number of days without results, you may have some good idea of what may be wrong regarding communication between simpbms and bmw i3 battery bms. I have followed the documentation from offical simpbms. Also flashed teensy with latest hex file from github for BMW i3 (GitHub - Tom-evnut/BMWI3BMS: SIMPBMS code for I3 Modules)

BMW i3 Slave connection diagram from simpbms documentation, it is also unclear from which direction the contact is but I guess it is from the front of the bms direction.

Connections: Simpbms (5v, CAN-L, CAN-H, GND) image below.

• Red wire connected to J5-5 (+5v)
• Black wire connected to J5-10 (GND)
• Blue wire connected to J5-9 (CAN-L)
• Yellow wire connected to J5-4 (CAN-H)

From Simpbms documention:

Result from debug is that "MODULE MISSING" and output is not correct:

Picture of the current BMS on I3 battery:

I do not know what could be wrong, I have double checked cables and connections a number of times and replaced cables with twisted pair / shielded cables without any results. If there is any more information I can give you, please let me know.

Thanks in advance!

 

[Tomdb]

Is there a termination resistor on the canbus? There is jumper on the SimpBMS board by connector J5.

 

[Tomdb]

Also the Header wiring is wrong you start at the other end.

The User manual has assumed you got a flylead with your battery module or a complet loom. Thats why there are colours listed.

They are even on the connector on the module itself.

 

[rndbit]

Is there a termination resistor on the canbus? There is jumper on the SimpBMS board by connector J5.

Hello Tomdb!

I closed the jumper on the SimpBMS at J5 also reverse order of the connector like your description but still same result (missing module) what could be?

Appreciate your help!

 

[Tomdb]

Do you have anything else that spits out canbus so you can check the canbus functions. Please turn on Candebug in the debug menu to see all received canbus messages.

 

[Tomdb]

Here is a picture just to confirm the way it should be wired. Colors match the SimpBMS manual

 

[rndbit]

Do you have anything else that spits out canbus so you can check the canbus functions. Please turn on Candebug in the debug menu to see all received canbus messages.

It is connected directly from BMS to simpbms, nothing in between, also I only use one bmw i3 module. I'll check debug from CAN when I get home from work. Appreciate your help!

 

[rndbit]

Here is a picture just to confirm the way it should be wired. Colors match the SimpBMS manual View attachment 130341

Current connections according to your description for the connector, picture below.

Also jumper is closed.

 

[Tomdb]

Please show your wiring on SimpBMS J5 connector. Just want to check everything before saying the BMW I3 CSC is dead. It be best to check can functionality of the SimpBMS using a known working Can device

 

[rndbit]

Please show your wiring on SimpBMS J5 connector. Just want to check everything before saying the BMW I3 CSC is dead. It be best to check can functionality of the SimpBMS using a known working Can device

Current wires to SimpBms

I will enable candebug when I get home and return with information about this. I just hope bms is not dead.

If it turns out to be broken, do you have any recommended place to buy a new one?

Big thanks for the help it is appreciated!

 

[rndbit]

Hi,

When I enable can debug it won't show anything sadly, I also try add some notification during canread to see if any bytes avaliable and nothing. I also tried the outside pins in the same order and no difference. (CANbus 0.00mA 99% SOC 99999.99mAh)

 

[Tomdb]

Wire it up as I showed to start. And leave the module unplugged form the cells for a while then plug it back in.

It might be good to get a cheap usb to canbus device to look if the bus is alive, the SimpBMS is sending info.

 

[rndbit]

Wire it up as I showed to start. And leave the module unplugged form the cells for a while then plug it back in.

It might be good to get a cheap usb to canbus device to look if the bus is alive, the SimpBMS is sending info.

Hello,

I wire it as you describe and unplugged the cells for a while and plugged it back again and still write missing module. I also changed cables once more incase.

I will get a CAN adapter and see if I can get anything out from it else I suppose the module is damaged and need to be replaced. You know any good place they sell this CSC modules?

Thanks again for all your effort and help!

 

[Delphin2021]

Also the Header wiring is wrong you start at the other end.
View attachment 130332

The User manual has assumed you got a flylead with your battery module or a complet loom. Thats why there are colours listed.

They are even on the connector on the module itself.
View attachment 130333

Tomdb, please tell me where to get such a description?
I need the pinout of the large connector that the cells are connected to.

 

[scottherrington]

Hi, did you have any progress with this?

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