OBD on BMW motorcycles
I am writing this because it seems like the BMW 10 pin motorcycle connector is a bit of a mystery to a lot of people. So I have desided to document all my troubles. In hopes that if you are going to make some motorcycle project for your BMW you wont have to suffer like I did.
So far I haven't made it too far... Below is a picture of the connector and table of it's values. In this picture we can be nearly 100% certain of the battery and ground, but the other two pins are some sort of Tx/Rx. The problem is I don't know how to start communication over the two wires. I will update when I've made more progress...
The bike is on a 12 volt system which can cause damage to circuit boards. Be sure you attach it appropriately!
|Pin #||Wire color||Ohms with disconnected battery||Voltage with key off||Voltage with key on||Likely...||OBDII Pin|
|1||Green/Blue||3.2 ohms||0 V||12.25 V||Switched Power||1|
|2||Red||2.2 KOhms||12.9 V||12.32 V||Unswitched Power||16|
|3||Brown||0.4 Ohms||0 V||0 V||Ground||4|
|4||Brown/Black||16 Ohms to 12.4 Ohms||0.003 V||11.2 V||K-Line BMS/ABS||7|
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