CAN bus reference?

[Teddy1975]

Does anyone have any information on the CAN BUS used in the V50/P1?

I'm working on my own infotainment system, ie a carputer. I know I can't be the first one to do so, not with commercial - and expensive - solutions available. I considered the MST-MOST upgrade for mp3 and smartphone integration, but that solution is wonky at best using the built-in LCD. The Bluepower solution almost fits the bill, but it seems like it is very slow booting and is full of things I'll never use, making it far too expensive for what I want.

I want to track the messages sent on the CAN bus regarding the climate control settings, and possibly the car settings menu, though that is secondary, as well as the steering wheel buttons. I may also make my own warning chimes system as I'm considering bypassing the factory audio system completely by installing an aftermarket amp and running new wiring to the door speakers.

Over the past couple of weeks, I've been searching the internet for information on the ID's used on the CAN bus for each module but haven't found much that I could use. I know I can get the info I need from logging all messages on the low speed CAN bus (although the chimes may need info from the HS CAN bus, too) but I'm not looking forward to shifting through tons of data looking for something that others may have found already.

Any and all help will be greatly appreciated.

Thanks,
Teddy

[RickHaleParker]

What you are looking for is a CAN DBC file. A CAN DBC file is a text file that contains information for decoding raw CAN bus data. If you come across any for Volvo .. I want to know. If you come across any Ford DBCs grab them. Ford and Volvo shared a lot of technology when Ford owned Volvo.

If you are good with SQL databases you can data mine the VIDA database. Some people have done it but, I have yet seen anybody publish a comprehensive DBC file.

[Teddy1975]

Thanks!

I've already downloaded VIDA after reading this blog post. Unfortunately the guy who wrote the blog post didn't go very far before seemingly abandoning it, possibly due to crashing his car. He also went the route of dissecting the VIDA database.

I've read waal70's blog posts regarding the CAN bus as well. He made it for his S60 so I don't know if the identifiers are the same, though.

Next step for me will be installing MSSQL server so I can dig deeper into VIDA.

[volvolugnut]

https://docplayer.net/18003375-Volvo-ve ... anual.html

I found this sometime in the past. I do not think this will be of much help, but it may be of some help.

I know nothing about CAN Bus.

volvolugnut

[BlackBart]

I took the CAN bus to work once. So slow.

[Teddy1975]

Yesterday, I extracted all the scripts from VIDA like Steve did here.

I've moved the 399 scripts that mention my model, mdl545yr2007 I believe it is, into a different folder. Now, these scripts are xml files which contain a lot of data that I'm still trying to figure out. For instance, this should read the Engine Temperature:

Code: Select all

<node id="nev10444160n1-nev10607651n1" y="11" x="301" nodeid="IdentifierComponent1" class="Components.IdentifierComponent">
    <property type="Out" id="nev10444160n1-nev10607652n1" class="Parameter" visible="1" value="" name="Engine coolant temperature sensor"/>
    <extension id="nev10444160n1-nev10607653n1">
    <identifier type="REID" id="nev10444160n1-nev10607654n1" value="0005" read="4" ecuMode="EcuType" ecu="284101">
       <parameter id="nev10444160n1-nev10607655n1" name="Engine coolant temperature sensor" textid="6348"/>
    </identifier>
</extension>
</node>

From that code snippet I think one would need to send '0005' to the ECU with the ID of '284101'. this happens to be the Engine Control Module (ECM), which in turn should reply with a 4 byte value representing the temperature of the engine coolant. However, I need to read Waal70's blog posts again and more thoroughly to see if I got it right.

[abscate]

I took the CAN bus to work once. So slow.

Good material there. The Can Bus has lots of polite people who have health care , Xc70s with manual transmissions , and other nice things

[BlackBart]

When I read "extracted all the scripts" I must admit my eyes glaze over a bit....

[abscate]

Thanks!

I've already downloaded VIDA after reading this blog post. Unfortunately the guy who wrote the blog post didn't go very far before seemingly abandoning it, possibly due to crashing his car. He also went the route of dissecting the VIDA database.

I've read waal70's blog posts regarding the CAN bus as well. He made it for his S60 so I don't know if the identifiers are the same, though.

Next step for me will be installing MSSQL server so I can dig deeper into VIDA.

I think this Steve nMontreal did find the queries and ID for parameters in thst blog, or at least how to get them

[crasbe]

I played around with this a little bit and it seems like this will only give you the diagnostic/request IDs. From what I can tell this does not give any information about the IDs and messages that are present in regular CAN communication.

Maybe someone can use my results, so I'll attach the SQL Query and Python script that extracts the zip files and searches for the correct model and year.

If you want to play around with this make sure to enable the options below in SQL Management Studio, so the column names are exported as well:

Bild_2023-02-18_231515778.png (31.06 KiB) Viewed 3820 times

This does not contain any information from the VIDA database, so it should be fine to publish. Use at your own risk etc.


With the extracted scripts it should be pretty easy to use the request ID protocol that is documented here: https://github.com/Alfaa123/Volvo-CAN-Gauge

For convenience the SQL query already attaches the correct ECU IDs to the output of the query.