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mercedes-hacking-docs's Issues
CAN bus connection to OBD2 Port
I tried to listen to my CAN bus on my W169 over the OBD2 port. I use an USB2CAN device and linux SocketCAN. I could successfully listen to my interior bus (CAN-B, speed 83'000) but somehow it is not possible to listen to CAN-C engine bus directly over the OBD2 port. For the interior bus, I connected my CAN device to the CAN connector near the SAM on the passenger seat side.
This is how I bring up the can device:
sudo ip link set can0 up type can bitrate 500000
sudo candump can0Unfortunately I can nothing see on the command line. Candump does not display any data.
I use an OBD2 to D-SUB 9 cable. I also sent the wakeup command before:
sudo cansend can0 01C#0210920000000000Nothing changed after trying again with candump.
Does anybody know what might be the problem?
reverse engineering formulas from xsmonitor_frame
If signal has UNIT, sometimes there is also calculation required. for example temperatures. Would love to see calculation formula in parse_dat_v4.py
Created some formulas based on guesswork (which work). Identified 15 unknown padding bytes in frame, unfortunately I don't know how reverse engineer formulas from that.
The (working) formulas are:
angelovAlex/can-bus-w211#3 (comment)
The full frame example is:
Click to expand
05 80 02 00 08 53 41 4d 5f 56 5f 41 32 00 17 00 |.....SAM_V_A2...|
00 00 00 00 04 00 07 80 00 01 00 0a 54 5f 41 55 |............T_AU|
53 53 45 4e 5f 42 00 08 02 01 00 00 00 00 00 00 |SSEN_B..........|
00 3f 00 00 20 c2 02 b0 43 13 41 75 df 65 6e 6c |.?.. ...C.Au.enl|
75 66 74 74 65 6d 70 65 72 61 74 75 72 07 80 00 |ufttemperatur...|
02 00 08 50 5f 4b 41 45 4c 54 45 08 10 02 01 00 |...P_KAELTE.....|
00 00 00 cd cc cc 3d 00 00 00 00 03 62 61 72 17 |......=.....bar.|
44 72 75 63 6b 20 4b e4 6c 74 65 6d 69 74 74 65 |Druck K.ltemitte|
6c 20 52 31 33 34 61 07 80 00 03 00 08 54 5f 4b |l R134a......T_K|
41 45 4c 54 45 18 10 02 01 00 00 00 00 cd cc cc |AELTE...........|
3d 00 00 20 c1 02 b0 43 1c 54 65 6d 70 65 72 61 |=.. ...C.Tempera|
74 75 72 20 4b e4 6c 74 65 6d 69 74 74 65 6c 20 |tur K.ltemittel |
52 31 33 34 61 07 80 00 04 00 06 49 5f 4b 4f 4d |R134a......I_KOM|
50 28 08 02 01 00 00 00 00 00 00 20 41 00 00 00 |P(......... A...|
00 02 6d 41 21 53 74 72 6f 6d 20 4b 6f 6d 70 72 |..mA!Strom Kompr|
65 73 73 6f 72 2d 48 61 75 70 74 72 65 67 65 6c |essor-Hauptregel|
76 65 6e 74 69 6c |ventil|
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