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MorGuux/DS2 Protocol.md

Last active April 2, 2025 01:21
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BMW E90 KCAN Notes
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DS2 Protocol.md

CAN structure

[Message ID] [Module ID] [Length] [Data1] [Data2] ... [Data n] [Checksum]

Message ID

0x6F1: Send request from diag scanner

0x612: Response from JBE (OBD2 firewall)

Module IDs

0x12: DME (ECU)

0x60: KOMBI (instrument cluster)

complete list available here

Data Length (data bytes + checksum)

Data bytes

0x0547: Coolant temperature

0x0458: Oil temperature (may match coolant temp due to lack of sensor on N47)

0x01F4: Boost pressure (target)

0x076D: Boost pressure (actual)

complete list available here

XOR Checksum

XOR checksum of all bytes in message (module ID + length + data bytes)

DS2 Packet structure

[Address] [Length] [Data1] [Data2] ... [Data n] [Checksum]

[Address]: Address of the computer being queried.

[Length]: Total number of bytes in the message (in hex).

[Data]: One or more bytes which comprise either the command (from you) or the response (from the computer).

[Checksum]: XOR checksum, based on all of the preceding bytes. This serves as basic error correction.

Credits

http://markgardnergibson.com/BMW/protocol.html

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