Hello to all.
I have a problem, I'm trying to do a program that could connect to the airbag control unit of Alfa 156 '97, should be a unit "Allied Signal", or "Signal2", a first airbag of 156 single-sided driving.
The problem and I do not know the protocol for diagnosis of this unit, very similar to the protocol ISO 9141.
Until now I managed to start the communication, the code iso from ECU and then a strange message that I can not understand.
I post here the communication:
Request: 29.4.2009 17:56:33.31264 (+26.5781 seconds)
Request: 29.4.2009 17:56:33.31264 (+26.5781 seconds)
00 -
ECU address - 5 baud
Answer: 29.4.2009 17:56:35.06264 (+1.7500 seconds)
Answer: 29.4.2009 17:56:35.06264 (+1.7500 seconds)
55 A7 86 02 97 9B - codice ISO - Allied Signal - 1200 baud
55 A7 86 02 97 9B - Code ISO - Allied Signal - 1200 baud
Request: 29.4.2009 17:56:35.60964 (+0.0000 seconds)
Request: 29.4.2009 17:56:35.60964 (+0.0000 seconds)
79 -
Key2 inverted (86 ~ 79)
Request: 29.4.2009 17:56:37.10964 (+1.4531 seconds)
Request: 29.4.2009 17:56:37.10964 (+1.4531 seconds)
02 00 02 -
Request identification code
Answer: 29.4.2009 17:56:37.18764 (+0.0469 seconds)
Answer: 29.4.2009 17:56:37.18764 (+0.0469 seconds)
05 FA -
Answer???
Request: 29.4.2009 17:56:38.74964 (+1.5000 seconds)
Request: 29.4.2009 17:56:38.74964 (+1.5000 seconds)
02 00 02 -
Request identification code - 2nd time
No more answers!
The configuration of the serial port and the following:
Bit start - 1
Start bit - 1
Bit dato - 8
Bit data - 8
Parita - none
Parity - none
Bit di stop - 1
Stop Bits - 1
5 baud to 'address ECU after 1200 baud
Please if anyone has an idea of what kind of protocol is it let me know.