Audi multifunction steering wheel

Hello everyone,

'Has anyone perhaps figured out the codes for the steering wheel buttons on an Audi that already has a CAN-based Multifunction Leather Steering Wheel (MFL)?' Six samples were taken from the older MFL (i.e., the one without the roller buttons).

Louder.
Quieter.
Fashion.
Next.
Sure, here is the translation of the text from German to English:

'Prev'
Phone.

The data should be readable on the comfort and infotainment CAN bus. Unfortunately, my Audi doesn't have MFL (Multi-Function Leather steering wheel), but I would like to simulate the buttons or at least find out how a specific button press can be detected.

Thank you and best regards,
Sure, here is the translation of the text from German to English:

'Dirk'

Hi, normally, the same codes should be coming from the radio here, since they are the same button codes.

Since when has the (Audi) radio been sending messages on the CAN bus when the buttons are pressed? Only the Navigation Plus sends something, when the TV tuner is selected as the source. Or have I misunderstood you? Anyway, as I've now found out, the data from the buttons is transmitted via LIN to the steering column control unit, and from there it's distributed via either DLB (old) or CAN Comfort (new).

Regards,
Sure, here is the translation of the text from German to English:

'Dirk'

Okay, so it seems I might have been mistaken. If I press the button, do the data not then appear on the 'comfort bus'? If that's the case, shouldn't the same encoding be sent, and the end result be the simulation of a button press? Mhhm?

As I said, the radios don't transmit; they only listen on the CAN bus to see if a message is coming from the steering wheel.

I don't know if the codes are the same for Audi and VW, but on my Passat, it's the following:


ID DLC Data
5C1 1 06 Vol up
5C1 1 07 Vol Down
5C1 1 0A Menu
5C1 1 1A Phone
5C1 1 22 Arrow Up
5C1 1 23 Arrow Down
5C1 1 28 OK
5C1 1 2B Mute
5C1 1 00 Button is released

Each button press triggers a transmission that is repeated twice (for a total of three repetitions), with each repetition occurring approximately 98 milliseconds apart.

Example of the 'Arrow Up' button being pressed:

Time ID DLC Data
05,154 5C1 1 22
05,253 5C1 1 22
05,351 5C1 1 22
05,450 5C1 1 00
05,548 5C1 1 00
05,646 5C1 1 00


Hope this helps.

Stig.

Up to the A4 B7 generation, the buttons were:

ID DLC Data.
5C3 2 39 0B Back (rotate left knob upwards).
5C3 2 39 0C Continue (move the left roller down).
5C3 2 39 06 Loud (raise the right roller).
5C3 2 39 07 Quieter (lower right roller).
// General sensor indicating the control mode in which the LFB (likely referring to specific buttons or functions) is operating (39 = Radio, 3A = Hands-free, NAVI = ??).
5c3 2 3A 03 // Adds phonebook entries displayed in the FIS (Fahrzeuginformationssystem).
5c3 2 3A 02 // Downloads the phonebook entries displayed in the FIS (Fahrzeuginformationssystem).
5c3 2 3A 1A // "Emulate" pressing the left button to answer calls or dial/hang up a contact from the phonebook.