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BMW BMS modules
Posted: Sat Feb 24, 2024 3:21 pm
by FFMan
I think one of the BMS modules on 330e pack has died. Seemed to have got wet when the cabin heater sprung a leak.
These appear to be individually numbered with a TZ number, and they are all different. Is this related to a can id or similar ?
If i replace a module do i have to code it in, or try and get the same number module ?
thanks
Re: BMW BMS modules
Posted: Sat Feb 24, 2024 6:11 pm
by andybpowell
I'm pretty sure in the early version they are all canbus and identical, in the later version the first one is the master but the other 4/5 are identical
they are also like hen's teeth
Re: BMW BMS modules
Posted: Sat Feb 24, 2024 6:33 pm
by tom91
The Gen1 can be recoded, SimpBMS coding handily provides this functionality.
If it is a second gen slave i do not know how the numbering works, you might be luckily and it is just a daisy chain and the modules are not "really numbered" just are in an order.
Re: BMW BMS modules
Posted: Sat Feb 24, 2024 6:39 pm
by andybpowell
From what I have read of the BMW documentation it's purely down to the position in the chain
Re: BMW BMS modules
Posted: Mon Feb 26, 2024 9:12 am
by FFMan
ok good - i think i'll try a module from the rear pack. This will prove if its positional or if they need coding etc
Re: BMW BMS modules
Posted: Mon Feb 26, 2024 9:54 am
by tom91
FFMan wrote: ↑Mon Feb 26, 2024 9:12 am
ok good - i think i'll try a module from the rear pack. This will prove if its positional or if they need coding etc
Are they the same generation? your signature says 9kwh and 12kwh, if they are both 6 modules packs they are Gen 1 and Gen 2 so not interchangeable slave modules.
Re: BMW BMS modules
Posted: Mon Feb 26, 2024 12:52 pm
by FFMan
interesting point - the batteries and modules look identical and respond to exactly the same code with no changes.
is that expected between gen1 & gen2 ?
Re: BMW BMS modules
Posted: Mon Feb 26, 2024 1:32 pm
by andybpowell
FFMan wrote: ↑Mon Feb 26, 2024 12:52 pm
interesting point - the batteries and modules look identical and respond to exactly the same code with no changes.
is that expected between gen1 & gen2 ?
do you have a picture of one ?
Re: BMW BMS modules
Posted: Mon Feb 26, 2024 1:53 pm
by andybpowell
FFMan wrote: ↑Mon Feb 26, 2024 12:52 pm
interesting point - the batteries and modules look identical and respond to exactly the same code with no changes.
is that expected between gen1 & gen2 ?
gen1 and 2 look very similar gen 2 are thinner on the outside edges and the master will be a differant colour mine is white
but thinking about it if they are all the same according to you, only gen 1 was available in both the 9 and 12 kwh packs, gen2 were introduced after they switched to the 2kwh modules so they must be all gen1 and so interchangeable but will need recoding from within the simp bms menu
Re: BMW BMS modules
Posted: Mon Feb 26, 2024 2:24 pm
by tom91
FFMan wrote: ↑Mon Feb 26, 2024 12:52 pm
interesting point - the batteries and modules look identical and respond to exactly the same code with no changes.
is that expected between gen1 & gen2 ?
Mentioned in different threads but will do again.
Gen1: All slaves the same
Gen2: Only the MasterSlave talks CAN, it then talks some form of ISO SPI to the other slaves. It is a different colour.
The pack internal CAN is the same, the MasterSlave spits out all frames for all slaves as it just gathers all the info.
Re: BMW BMS modules
Posted: Mon Feb 26, 2024 2:24 pm
by FFMan
andybpowell wrote: ↑Mon Feb 26, 2024 1:32 pm
do you have a picture of one ?
it's a close up of the info panel - best i have to hand
Re: BMW BMS modules
Posted: Mon Feb 26, 2024 2:36 pm
by FFMan
tom91 wrote: ↑Mon Feb 26, 2024 2:24 pm
Mentioned in different threads but will do again.
Gen1: All slaves the same
Gen2: Only the MasterSlave talks CAN, it then talks some form of ISO SPI to the other slaves. It is a different colour.
The pack internal CAN is the same, the MasterSlave spits out all frames for all slaves as it just gathers all the info.
ok - all my slave units are black so gen1, but sounds like if i swap them in/out i'll need to renumber which i can do in simpbms ?
Re: BMW BMS modules
Posted: Mon Feb 26, 2024 2:55 pm
by andybpowell
Yep
Re: BMW BMS modules
Posted: Mon Feb 26, 2024 2:56 pm
by tom91
Yes SimpBMS can do this.
Did you get the Gen 2 modules separate from the BMS Slaves?
Re: BMW BMS modules
Posted: Mon Feb 26, 2024 3:41 pm
by FFMan
tom91 wrote: ↑Mon Feb 26, 2024 2:56 pm
Yes SimpBMS can do this.
Did you get the Gen 2 modules separate from the BMS Slaves?
i'm not aware i have any gen 2 modules. i think both myu packs are gen1, and all the modules are black and original to the packs
Re: BMW BMS modules
Posted: Mon Feb 26, 2024 3:48 pm
by royhen99
From photos here
viewtopic.php?p=61468#p61468 your rear pack is gen2. Gold coloured covers on modules and white cmc on the module marked "6".
Re: BMW BMS modules
Posted: Mon Feb 26, 2024 4:32 pm
by andybpowell
Yea you really need to decide if they are all black or not as shown in the picture, I'd hope BMW would have keyed the connectors so they are not interchangeable but you never know and plugging the wrong modules in could prove costly
Re: BMW BMS modules
Posted: Mon Feb 26, 2024 4:36 pm
by andybpowell
I'm guessing from the picture you supplied earlier that you have gen1 on the 1.5kwh modules since it's dated 2017 and gen 2 on the 2kwh
Re: BMW BMS modules
Posted: Tue May 07, 2024 3:22 pm
by ted.walsh
I have a couple of sets of the G1 26ah cell and the G2 34ah cell packs, the wiring looks similar between the two brick types but is bump polarized on the connector to stop plugging in an inappropriate module either way, I dare say you can remove the connector shell as this is easy to do, but I didn't need to and just took it that the are different enough not to mix. essentially without a lot of buggering about they are chalk and cheese.
Also be on the lookout for bricks with a RED connector, these are 8s2p configuration, black appears to be 16s
Re: BMW BMS modules
Posted: Wed May 08, 2024 7:13 am
by FFMan
thanks
I have a gen1 pack up front and a gen2 pack in the rear. The BMS is different but responds to same can commands which is useful
Re: BMW BMS modules
Posted: Tue Jun 03, 2025 8:52 pm
by mane2
I’m unfortunate to join this thread. I accidentally gave 12V for the master slave (gen2) and now it won’t respond
to can messages anymore. It pulls power about 0,6 amps and about 1A when giving interlock 5V. Can bus shows steady 2.5V all the time but won’t respond to any messages. I think I might have fried something but when looking at the card, I can’t see anything burnt or smelly. It’s X5 pack with 12 modules, master is white and others are black. Now I wonder what to do. I don’t think bmw sells these from the counter?
Here’s two pics of the board.
Any ideas? Anyone have one to sell?
Re: BMW BMS modules
Posted: Tue Jun 03, 2025 9:23 pm
by mane2
Oh! BMW sells these separately!
https://parts.bmwmonterey.com/p/Bmw_202 ... 69525.html
I wonder will they work with existing slaves.
Re: BMW BMS modules
Posted: Tue Jun 03, 2025 9:30 pm
by tom91
Most likely needs coding in a full pack and possibly car before its happy.
Re: BMW BMS modules
Posted: Wed Jun 04, 2025 4:45 am
by mane2
tom91 wrote: ↑Tue Jun 03, 2025 9:30 pm
Most likely needs coding in a full pack and possibly car before its happy.
Hopefully not. I guess nobody has tried to swap that before.
But yeah, in worst case, it could be that even used one might need some coding with the car. That would be practically impossible. This mistake might have became an expensive one.
Re: BMW BMS modules
Posted: Wed Jun 04, 2025 7:19 pm
by mane2
Got lucky and my local BMW dealer had that exact same master csc with same part number (200€). So I plugged it in and can-bus is back alive. Now testing with SimpBMS, I can see all 12 modules appear, but voltages and temps only for first 6 modules.
Code: Select all
BMS Status : 1 Ready 48
Out:0000 Cont:0000 In:0000 Charge Current Limit : 30 A DisCharge Current Limit : 30 A
Modules: 12 Cells: 48 Strings: 1 Voltage: 177.380V Avg Cell Voltage: nanV Low Cell Voltage: 3.691V High Cell Voltage: 3.699V Delta Voltage: 8mV Avg Temp: 11.583C
Module #1 29.56V Cell0: 3.69V Cell1: 3.69V Cell2: 3.69V Cell3: 3.69V Cell4: 3.69V Cell5: 3.69V Cell6: 3.69V Cell7: 3.69V
Temp 1: 23.00C Temp 2: 23.00C Status: 0x0 Bal: 0x0
Module #2 29.54V Cell8: 3.69V Cell9: 3.69V Cell10: 3.69V Cell11: 3.69V Cell12: 3.69V Cell13: 3.69V Cell14: 3.69V Cell15: 3.69V
Temp 1: 23.00C Temp 2: 23.00C Status: 0x0 Bal: 0x0
Module #3 29.56V Cell16: 3.69V Cell17: 3.69V Cell18: 3.69V Cell19: 3.69V Cell20: 3.69V Cell21: 3.69V Cell22: 3.69V Cell23: 3.69V
Temp 1: 23.00C Temp 2: 24.00C Status: 0x0 Bal: 0x0
Module #4 29.56V Cell24: 3.70V Cell25: 3.69V Cell26: 3.69V Cell27: 3.69V Cell28: 3.70V Cell29: 3.69V Cell30: 3.69V Cell31: 3.69V
Temp 1: 23.00C Temp 2: 23.00C Status: 0x0 Bal: 0x0
Module #5 29.58V Cell32: 3.70V Cell33: 3.70V Cell34: 3.70V Cell35: 3.70V Cell36: 3.70V Cell37: 3.70V Cell38: 3.70V Cell39: 3.70V
Temp 1: 23.00C Temp 2: 23.00C Status: 0x0 Bal: 0x0
Module #6 29.58V Cell40: 3.70V Cell41: 3.70V Cell42: 3.70V Cell43: 3.70V Cell44: 3.70V Cell45: 3.70V Cell46: 3.70V Cell47: 3.70V
Temp 1: 24.00C Temp 2: 23.00C Status: 0x0 Bal: 0x0
Module #7 0.00V Cell48: 0.00V Cell49: 0.00V Cell50: 0.00V Cell51: 0.00V Cell52: 0.00V Cell53: 0.00V Cell54: 0.00V Cell55: 0.00V
Temp 1: 0.00C Temp 2: 0.00C Status: 0x0 Bal: 0x0
Module #8 0.00V Cell56: 0.00V Cell57: 0.00V Cell58: 0.00V Cell59: 0.00V Cell60: 0.00V Cell61: 0.00V Cell62: 0.00V Cell63: 0.00V
Temp 1: 0.00C Temp 2: 0.00C Status: 0x0 Bal: 0x0
Module #9 0.00V Cell64: 0.00V Cell65: 0.00V Cell66: 0.00V Cell67: 0.00V Cell68: 0.00V Cell69: 0.00V Cell70: 0.00V Cell71: 0.00V
Temp 1: 0.00C Temp 2: 0.00C Status: 0x0 Bal: 0x0
Module #10 0.00V Cell72: 0.00V Cell73: 0.00V Cell74: 0.00V Cell75: 0.00V Cell76: 0.00V Cell77: 0.00V Cell78: 0.00V Cell79: 0.00V
Temp 1: 0.00C Temp 2: 0.00C Status: 0x0 Bal: 0x0
Module #11 0.00V Cell80: 0.00V Cell81: 0.00V Cell82: 0.00V Cell83: 0.00V Cell84: 0.00V Cell85: 0.00V Cell86: 0.00V Cell87: 0.00V
Temp 1: 0.00C Temp 2: 0.00C Status: 0x0 Bal: 0x0
Module #12 0.00V Cell88: 0.00V Cell89: 0.00V Cell90: 0.00V Cell91: 0.00V Cell92: 0.00V Cell93: 0.00V Cell94: 0.00V Cell95: 0.00V
Temp 1: 0.00C Temp 2: 0.00C Status: 0x0 Bal: 0x0
CANbus 0.00mA 0% SOC 0.00mAh
!!! MODULE MISSING !!!
I never tested the original CSC master with more than 4 modules, so now I'm not sure if this is something in SimpBMS code that I need to fix or is this something related to that new master "slave" card.
Any ideas?