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How to read OBD II ISO 9141 K-line data?

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I got a 1998 model Hyundai H1, with 12 pin diagnostic connector
There is only 3 pins in use.
1 K-Line Engine control diagnostic and error codes
2 K-Line Airbag diagnostic
12 GND Ground


I want to use Vagcom 409.1 to read the data
And a KKL USB Interface 409.1V cable (USB)

I want to read the air bag data

And my question is what input do I need on the interface?

I got K-line and ground, is the ground from the car signal or chassi ground?

Do I need to add +12 Volt and ground to the interface?


Any tip is welcome...;-)
Will it work?
 

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