Audi A8 4H Instrument Cluster Wakeup

Hi.

I have a combination instrument panel from an Audi A8 4H (manufactured in 2010) that I would like to operate separately from the vehicle. The wiring diagram indicates that there are 2 pins for terminal 30 (battery positive) and 2 pins for terminal 31 (battery ground). There is a missing pin for terminal 15, which is used for the ignition positive.

Okay, here's the translation:

'Now, to my question: Is there a way to 'wake up' the control unit, similar to turning on the ignition? Due to the absence of terminal 15, I suspect a wake-up mechanism via CAN.'

Does anyone happen to have any information about this?

Thank you very much!

The clamp signal should be at ID 0x575.

Thank you for your answer! I will test it directly on Monday .

Let's see if a simple CAN message with the correct ID is sufficient, or whether the data bytes also play a role in determining the ignition status.

You have to send the right thing .

Search the forum for '0x575' ...

So far, so good. I tested this with ID 0x575. It seems that the ignition signal is expected to be the message '0700' every 100-200 milliseconds. However, this unfortunately still doesn't trigger the instrument cluster to start.

Other values that were tested include:
10,200,000
01000000
11,000,000


Setup using a Carberry device via SocketCAN:
Connect +12V to pin 31 or 32 (these pins are internally connected).
Connect GND to pin 29 or 30 (same applies).
CAN-High connected to pin 3.
CAN-Low to pin 4.

For testing purposes, also apply +12V to pin 1 (J533 diagnostic connector).

According to my plan, 'diagnostic interface for data bus J533' is connected to pin 1. Could it be that a wake-up signal needs to be sent to the instrument cluster first through this connection?

I found a package that works with the station wagon.

3C0#6A7E1335

Does anyone recognize this ID and can confirm that it was used to start the ignition?

sw1337sw wrote:

I found a package that makes the combination work: 3C0#6A7E1335 Does anyone know the ID, and can confirm that it is related to the ignition?

Okay, I understand. Please provide the German text you want me to translate into English.
Yes, this ID refers to the ignition status.

D0=6A
D1=7E
D2 = 13
D3 = 35

means:
D2 = 00010011b (b7...b0)
b0 - s-contact
b1 - ignition
b2 - Terminal 75.
b3 - Terminal 50
b4..b7 - reserved [?Bitte gib mir den deutschen Text, den du übersetzt haben möchtest.

All other bytes should be uninteresting. Because the ignition information is only contained in byte D2.

Thank you for your reply!

After hours of fuzzing with random CAN-data, I think I turned on the immobilizer on the dashboard. It shows me a red text saying 'SAFE'. Does anyone know more about that? Is it possible to disable it?

Sure!

SAFE indicates that the immobilizer is active.
"My A3 speedometer also has that issue when I put it on my desk. However, it still works perfectly fine for CAN bus projects."

I've set up a cluster from an A6 2005 using an Arduino, but the cluster is going into "CP" mode. I haven't connected a CAN gateway. It's interesting that for a few seconds it was working correctly, and now it's in CP mode. Is it possible to bypass the CP mode, or should I send fake messages to make it think it's in the correct car?