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Sorry if I'm missing something really obvious here, but... having made the ECU transmit the codes, does that reset/clear them as well?

I assume you have to send a particular byte (or several?) to start the transmission by the ECU that you showed us. I wonder how on earth you figured out what that byte was - brute force attack? :) And perhaps having found it, you'd rather keep it secret.

My 164s don't have airbags and I have the Alfadiag software/OBD2 cable that has communicated with the airbag ECU in my 156. But I was curious and just trying to understand in general how the process works for the interface you've made. Cheers!

-Alex
 

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One sends the ECU address (0x80, courtesy of 164TD) and receives a response of 6 bytes at 4800 baud: 0x55, four keybytes, and a checksum. ECU was responding with the right sequence. Next the tester has to send the acknowledgment
Thanks for that - interesting to learn how it works.

-Alex
 
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