Audi A4 avant B8 MY 2011 comfort CAN bus id

23-12-2016, 20:46 Subject: Audi A4 avant B8 MY 2011 comfort CAN bus id

[Translating...]

Hello all,
is there some one of you that knows the Audi a4 avant comfort CAN bus ids? In particular, I need to know the ignition(Klemme 15) ID of the message that flows on the comfort CAN.
Thanks a lot in advance and merry Xmas to you all.

05-01-2017, 17:34 Subject: Audi A4 avant B8 MY 2011 comfort CAN bus id

[Translating...]

Hi,
You can try this ID
0x3C0

Ignition:
byte[2] = 0x07

05-01-2017, 22:19 Subject: Audi A4 avant B8 MY 2011 comfort CAN bus id

[Translating...]

Hello paulius,thank you so much for your answer,I appreciate a lot.
As soon as possible I will take it a try and I will reply the result.
In the past I have seen that the 0x3A3 id byte[7] was correlated with the ignition
so the byte was 0x00 with ignition off and 0xFF with the ignition switched on
but I was not totally confident that was the right id to watch to...
Thank you again.

Last edited on 09-01-2017, 22:03, edited 2 times in total.

[Translating...]

Giallino wrote:

Hello paulius,thank you so much for your answer,I appreciate a lot.
As soon as possible I will take it a try and I will reply the result.
In the past I have seen that the 0x3A3 id byte[7] was correlated with the ignition
so the byte was 0x00 with ignition off and 0xFF with the ignition switched on
but I was not totally confident that was the right id to watch to...
Thank you again.

No problem

In CAN traffic you can see a lot of IDs who are changing with Ignition. Because you see not only ignition status, but also status of a lot of ECUs (i.e. climatronic). And they are "on" with ignition.

Usually ignition is just 1bit. In my example are 3bits, because i'm checking 3 status together (ACC (s-contact), ignition and Klemme 75).

ID 0x3A3 comes from Engine ECU.
Your byte shows something like "car ready" status. 0xFF means 100% ready (something like this).

09-01-2017, 22:07 Subject: Audi A4 avant B8 MY 2011 comfort CAN bus id

[Translating...]

This the reason why I have written here , I was not totally sure that 0x3A3 id byte[7] was directly representing the ignition status,it is almost true and related to the ignition switch,but this is not totally true.As soon as I will have some time,I will look for 0x3C0 id.
Thank you again and sorry for writing in English ,my deutsch it is very poor.