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Old 07-28-2010, 04:20 PM   #4
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Join Date: Jan 2009
Location: Perry Ga
Posts: 198
My Ride: 325i 2002
INPA is the diagnostic protocol that bmw uses when programming the car and inspecting electronics. It is usually connected through the odb II connector. SSS is something that uses INPA (there are a few others).

There are a few different bus systems in the car.
here is a good document talking about the bus systems although it is for other cars.

You theoretically could reverse engineer the M-Bus and control the climate system but that would require a lot more work.

With reiser interface you can control I/K buses as they are technically the same but with different peripherals.
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