Comfort CAN for VW/Audi Vehicles

Hi,

I'm very interested in getting some information. I own a Volkswagen Golf IV from 2003, which already has the Comfort CAN bus system. It has a combination instrument panel with the large navigation display, and I would like to modify the following things via the CAN bus:

- Add a menu entry to the MFA (Multi-Factor Authentication) menu.
- Displaying arbitrary text and potentially graphics on the screen.


I just want to add a few features, like displaying the oil temperature and intake air temperature.

Unfortunately, my car's navigation system is still connected via 3G, which means I can't log the CAN bus data.

Can you help me?

Thank you and best regards,
Sven.

Hi,

Okay, the messages for the display should be 627h (8 bytes) and 62Fh (4 bytes).
Byte 627 is a status register; the remaining 7 bytes constitute the display content.

ID (hexadecimal) Byte (0..7) Meaning
571 0 Battery voltage.
531 0 Light, various lamps, bit-encoded.
531 1 Turn signals, etc., bit-encoded.
35B 1.2 Engine speed.
35B 3 Coolant temperature.
35B 7 Fuel consumption.
527 1.2 Speed
527 5 Outside temperature.
555 4 Boost Pressure
555 7 Oil temperature.
3E3 2 Interior temperature.
5E3 1...7 Temperatures for climate control/window temperature.
65D 1...7 KM Standing, Date, Time.
291 2 ZV commands.
181 0.1 Window lift commands.
4B9 0 Status: Central locking door, right-hand side.
49B 1 Status: Front door, hallway.
501 0 Commands for mirror adjustment.
470 1 Door contacts
470 2 Brightness Display

The MFD (Multi-Function Display) version G from the Passat also creates a 'Navigation' menu entry in the MFA (Multifunction Display) menu. How do they achieve that?

Best regards,
Sven.

EDIT: How is the phonebook displayed in the MFA menu? There must be a way to do it via CAN, right?

Hi,
That's actually quite interesting. I hope the fish tank thing works out; that would be a fantastic addition to my car PC setup.

But I also have a few more questions regarding the car.

Can the button presses of the steering wheel remote control be read out?
Can the key presses of the MFD Type D be read out?
Can the central locking system also be queried (to shut down the computer)?

That's all I could think of for now.
thank you.
hello

edit:
Okay, one more thing: If you have a navigation system connected, you always have the 'Navigation' menu option.

Hi,

How does it actually work? For example, could you send a 'close door' signal and would it then execute that command?

And what display is ID470?

Regarding the display in the instrument cluster, could you simply send something to it and have it display information, since the original data is still being transmitted? Or would you need to somehow block that original data? In other words, would you need two CAN adapters: one to read all the data, a software program to modify the data, and a second CAN adapter to feed the modified data back in?

Yes, I know, it's a lot of questions, but it's a really interesting topic.

Hi Marco,

Hi,

I once logged the Comfort CAN data on my Golf.
I can confirm the following IDs for you:

181 - Window lifter. However, it doesn't seem to be for the driver's side.

501 - Mirror adjustment and heating.

291 - ZV commands.

In addition, there are quite a few IDs floating around.

May I post a screenshot here? That way, we could see if there's anything similar.


Here's the translation:

'Another question: Are all these IDs only for the comfort CAN bus, or are some of them also from the engine CAN bus? For example, intake air temperature and oil temperature don't appear on my comfort CAN bus...'

Best regards,
Sven.

Hello,

Do you know how the recognition of CAN modules works? It seems like CAN messages are only received if the module somehow registers itself.
Is there any indication that registration is required at any embassies?

Can you tell me what the values in these messages mean? (These are messages sent through a speedometer from a Volkswagen Golf 4.)

ID | Length | Data (0-7)
271 1 3
351 8 CC 0 0 0 0 90 91 0
353 8 B 0 0 47 0 0 0 0
408 6 8 2 80 0 0 0
551 1 2
5C3 2 0 0
621 3 0 0 80
623 8 2 0 8 41 0 0 0 0
62F 4 1 0 0 0
635 3 0 FF 0
651 6 80 3 40 80 18 41
653 6 1 2 0 0 C0 78
659 8 1 4 0 0 1 0 0 0

Thank you!

Hi,

I started reading data from my Touran using the CAN interface and also tested it; it works perfectly.
Here are the left and right window lifters (for now).
(but I only have power windows in the front).
VW Touran 1.9 TDI, year of manufacture 2005.

CAN-E-R-DLC - Message Fields
ID ----------- 1 2 3 4 5 6 7 8
181-0-0--3-- 00 00 00---------------- FH Passenger Side
181-0-0--3-- 01 00 00---------------- FH Typing - High Score
181-0-0--3-- 02 00 00---------------- FH RE Automatic High
181-0-0--3-- 04 00 00---------------- FH Re, press and hold to lower volume.
181-0-0--3-- 08 00 00---------------- FH Re Automatic Down.
181-0-0--3-- 00 00 00---------------- Driver's side, FH Li.
181-0-0--3-- 10 00 00---------------- FH Li Tip-High
181-0-0--3-- 20 00 00---------------- FH Li Automatic High
181-0-0--3-- 40 00 00---------------- FH Li Call/End.
181-0-0--3-- 80 00 00---------------- FH Li Automatic Lowering.

and a Ford Focus.
Ford Focus Ghia, manufactured in 2006.

Power windows for front and rear.

CAN-E-R-DLC - Message Fields
ID ----------- 1 2 3 4 5 6 7 8
225-0-0--5-- 04 00 00 00 00-------- FH Allgem. OUT
225-0-0--5-- 04 00 00 20 00-------- FH RE Rear Up
225-0-0--5-- 04 00 00 40 00-------- FH RE Down/Lower Rear.
225-0-0--5-- 04 00 00 02 00-------- FH Li Rear High
225-0-0--5-- 04 00 00 04 00-------- FH Li Rear Down.
225-0-0--5-- 04 00 02 00 00-------- FH Re Front Upper
225-0-0--5-- 04 00 04 00 00-------- FH Re Front Down
225-0-0--5-- 04 00 20 00 00-------- FH Li Front High
225-0-0--5-- 04 00 40 00 00-------- FH Li Front Down
225-0-0--5-- 04 02 00 00 00-------- Rear Seat, Lithium Ion Battery Compartment Locked/ Child Safety Lock Enabled.

265-0-0--3-- 20 10 00---------------- Turn signal, left.
265-0-0--3-- 40 10 00---------------- Turn signal, right.
265-0-0--3-- 60 10 00---------------- Warning light system.

The automatic tipping function still needs to be determined.

Unfortunately, typing on this device is too cumbersome for me, and I'm unable to upload any hard copies or PDFs here.

I cannot guarantee the accuracy of the information provided, as the identification numbers may vary depending on the specific version/model and year of manufacture.

Best regards,

Wheelchair_Can.

Hello!

I'm bringing this thread back up.
I am currently looking for CAN messages related to the Tiptronic transmission. I'm primarily interested in information for the Volkswagen Golf 4, but data for the Golf 5 would also be very interesting.

P.S.: To what extent are the data protocols for older VW models (e.g., Passat 3BG, Golf 4) compatible with those of newer models (e.g., Passat 3C, Golf 5)? Does anyone here have any experience with this?

I would be very interested in any news regarding the GRA (German Road Assistance) buttons for the Touareg, both the ones with 4 buttons and the ones with 6 buttons. Thank you in advance!

Hello,

I would also be interested in some IDs from the VW/Audi CAN bus (either powertrain or comfort functions, it doesn't matter).

What would be helpful are:

Speed, RPM, intake temperature, boost pressure, and anything else you want to include.
You know what I mean.

Best regards,
Mario

Then show me some pictures of the MFA .

SGM

Hello everyone,

Even though this is a bit older, could someone please explain it?

I read the data from the Comfort CAN bus on a VW Caddy manufactured in 2010.
ID 35B Byte 7 always counts from 0x80 to 0xFF and then resets back to 0x80. I know that it increases faster the more I press the accelerator, but I don't quite understand what this number represents. It can't possibly be the entire fuel consumption (over all time or since the engine started). And what unit is it measured in?^^

Regarding the outside temperature: The value I could read there was 0x7F, which is 127 in decimal. It was quite chilly that morning; it definitely wasn't 127°C. Is the step size 0.1° per bit gain? And how are negative temperatures indicated? If so, does bit 7 of this byte represent a high value?

Best regards,
Volvox.

Okay, I have finally http://www.canhack.de/en/viewtopic.php?t=1967 found the answer regarding the consumption value for 35B.
Unfortunately, it's not very easy to use.

However, the temperature values are still unclear to me.

ID 531h.

11h = left turn signal.
12h = right turn signal.

40h = brake
51h = brake light + left turn signal.
52h = brake light + right turn signal.

muurman wrote:

id 531h 11h = left turn signal. 12h = right turn signal. 40h = brake 51h = brake light + left turn signal. 52h = brake light + turn signal right

Nice, but how are they distributed across a maximum of 8 data bytes?

oeps byte 1