canbus deciphering

[littlescrote]

Thanks for sharing your understanding. I can understand it. Sounds like it may also resemble CANopen.

Will have to have a play sometime, CAN bus and Modbus is part of my day job.

CSS is a great resource.

 

[Pshemek]

Registered TPMS list

(I don't know if its first or second set)

Req.Id: 0600 Resp.Id: 500, pid: 2128

resp: [05] [00] [61] [28] [00] [0e] [eb] [52] [fc] [0e] [e8] [e2] [b1] [0e] [eb] [53] [06] [0e] [e8] [e2] [ae] [ff] [ff] [ff] [ff]

1st tpms id: [0e] [eb] [52] [fc]
2nd: [0e] [e8] [e2] [b1]
3rd: [0e] [eb] [53] [06]
4th: [0e] [e8] [e2] [ae]

remark: sensors are away so I believe - instead of FFs at the end - there should be actual TPMS sensor readings?

Please correct me if its wrong assumption.

I was wrong here.
Last four 0xFFs are for 5-th (spare) wheel. I don't have it registered - so no real code here.

I have bonus though:

It is successfull session of registering new tpms sensors (for set 1.):

Get VIN:
> 00 00 07 e0 1a 90
< [00] [00] [07] [e8] [5a] [90] [4a] [4d] [42] [58] [__] [__] [__] [__] [__] [__] [__] [__] [__] [__] [__] [__] [__]
J M B X x x x x x x x x x x x x x

> 00 00 07 df 10 92
> 00 00 00 1c 10 92
> 00 00 07 df 3e 02
> 00 00 00 1c 3e 02

Get P/N:
> 00 00 06 00 1a 87
< [00] [00] [05] [00] [5a] [87] [04] [64] [00] [01] [ff] [43] [00] [2c] [01] [01] [38] [36] [33] [37] [42] [33] [32] [38] [20] [20]

Get SW/VER:
> 00 00 06 00 1a 9c
< [00] [00] [05] [00] [5a] [9c] [01] [04] [64] [00] [01] [ff] [2c] [01] [01] [38] [36] [33] [37] [42] [33] [32] [38] [30] [30]

> 00 00 06 00 31 a2 00
< [00] [00] [05] [00] [7f] [31] [33]

> 00 00 06 00 27 01
< [00] [00] [05] [00] [67] [01] [89] [7c] [16] [f9]

> 00 00 06 00 27 02 61 55 4e a0
< [00] [00] [05] [00] [67] [02] [34]

> 00 00 06 00 31 a2 00
< [00] [00] [05] [00] [71] [a2]

Get detected sensors:
> 00 00 06 00 21 a2
< [00] [00] [05] [00][61][a2][00][10] [ff][ff][ff][ff][ff][ff] [ff] [ff] [ff] [ff] [ff] [ff] [ff] [ff] [ff] [ff] [ff] [ff] [ff] [ff]

after 1st tpms found:
> 00 00 06 00 21 a2
< [00] [00] [05] [00] [61] [a2] [01] [10] [02] [5f] [aa] [4f] [ff] [ff] [ff][ff][ff][ff][ff][ff][ff][ff][ff][ff][ff] [ff] [ff] [ff]

after 2nd:
> 00 00 06 00 21 a2
< [00] [00] [05] [00] [61][a2][03][10] [02][5f][aa][4f] [02][5f][a9][ed] [ff][ff][ff][ff][ff][ff][ff] [ff] [ff] [ff] [ff] [ff]

after 3rd
> 00 00 06 00 21 a2
< [00] [00] [05] [00] [61][a2][07][10] [02][5f][aa][4f] [02][5f][a9][ed] [02][5f][a1][11] [ff][ff][ff][ff] [ff] [ff] [ff] [ff]

after 4th:

> 00 00 06 00 21 a2
< [00] [00] [05] [00] [61][a2][8f][00] [02][5f][aa][4f] [02][5f][a9][ed] [02][5f][a1][11] [02][5f][a7][18] [ff][ff][ff][ff]

> 00 00 07 df 10 81
> 00 00 00 1c 10 81

Please remember - this procedure involves decreasing tyre pressure atleast 20kPa in each tyre starting from Front Left, next FR, RR, RL.
After decrease - up to one minute is needed to detect sensor.
Code: SendID: 0600, Pid: 21a2 is sent repeatedly to detect changes.

Hope - this will help someone.

Anyone who know how to register new sensors knowing their ID's without "learn" procedure described above?