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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > F30 DIYs and Coding Discussions > Hard wire in to ethernet without OBDII plug?
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      02-15-2017, 09:34 PM   #1
bradsm87
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Hard wire in to ethernet without OBDII plug?

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Is it possible to hard wire in to the ethernet bus without using the OBDII port, while still leaving the OBDII ethernet to function fully?

The following modules have ethernet interfaces:

FAS
Headunit
Instrument cluster
CBX-Media
CBX-ECALL
Audio amplifier

Ethernet uses star topology rather than ring topology so there must be something that operates as an ethernet switch or hub. Does the FAS have switch/hub functionality built in to it and each of the other modules all connect back to the FAS or is the switch/hub functionality in another module?
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      02-17-2017, 03:24 PM   #2
Wires
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There doesn't have to be a switch in there at all.

The Ethernet on the ODBII can just be connected to one module that deals with interface to the outside world. The E90 was a serial type interface, the F30 Ethernet, I'd doubt you'll find a network switch in there.
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      02-17-2017, 04:50 PM   #3
bradsm87
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Quote:
Originally Posted by Wires View Post
There doesn't have to be a switch in there at all.

The Ethernet on the ODBII can just be connected to one module that deals with interface to the outside world. The E90 was a serial type interface, the F30 Ethernet, I'd doubt you'll find a network switch in there.
I read the F30 electrical description and those modules I listed use ethernet to communicate (Not just ethernet from the FEM to OBDII).

Does anyone have a full pinout list for the FEM?
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      02-18-2017, 10:45 AM   #4
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Why bother with trying to hack into the car's network? An OBDII-to-ethernet cable isn't very expensive, and there are also bluetooth OBDII adapters as well if you're looking to use an app to monitor engine parameters. Besides, if you were able to connect directly, you probably wouldn't be able to interpret any of the packet traffic.
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      02-18-2017, 06:12 PM   #5
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I'd be really concerned about injecting external ESD or just plain loading of the system.

Ethernet is only used for the diagnostic tools and module firmware upgrades. I'd be wary that it hasn't been designed for the robustness of continuous type connectivity (inducing ESD for example). It was meant for private communications and not public ones.
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