Central locking control unit in the 8D2

I can't access the central locking control module (ZV STG) using VAG-COM. All other modules work fine, and I can access all systems in our A6. However, the window closing function via the door lock does work. I had planned to also program the window opening function, but the control unit isn't responding at all.

Are only specific vehicle control units accessible (only with a diagnostic tool?), or is there a fault in my K-line?

Stupid question...

What salutation do you use?
In some A6 models, the comfort control unit (address word 46) was already installed. In the A4, the control unit for the central locking system (address 35) was present.

I use 35. But even when trying port 46, nothing responds.

It was just a shot in the dark on my part. It's possible you were only trying it under the 46 setting.

Could the central ventilation system have been retrofitted at some point?

Otherwise, it would probably be necessary to check the wiring of the control unit.

No, it was included as standard equipment. It wasn't easy to get the A4.

Assuming you have a 4B connection, it should work without any problems.
What hardware/software do you use?

I'm a bit confused - you wrote 'A4' in the title and in the first post, but then 'A6' below?!

To avoid any misunderstandings.

I have an A4, model 8D2. My father has an A6, model 4B. On my A4, I can't read the central locking system data. All the control units in my father's A6 are responding.

I am using VAGcom 3.11 shareware and a KKL interface from PCI K.Vetter.

bastion wrote:

I have an A4, model 8D2. My father has an A6, model 4B. On my A4, I can't read out the central locking system (ZV) as the only thing. In my father's A6, all the control units are responding.

Since you can access all the other control units, address 35 shouldn't cause any problems either. I would first check the wiring and, if necessary, perform a hard reset on the control unit by disconnecting it from power for a few minutes. It wouldn't be the first time that a crashed control unit is the cause of the problem.

bastion wrote:

I use VAGcom 3.11 shareware and a KKL interface from PCI K.Vetter

.

P.S.: It might be advisable to ask in the forum next time, as the manufacturer/distributor usually has a better understanding of their own hardware.

Okay, so a reset of the control unit didn't help. Most likely, the interface has a problem, since the K-line is working correctly.

I doubt the interface is the problem, and since you haven't posted any specific details about the vehicle yet, it's difficult to say anything concrete. What about the year of manufacture/model year? Can you access the control unit with another device (e.g., a dealer)?

Model 8D2 (pre-facelift A4, manufactured in 1996). I haven't been to the dealer yet, but I'll go on Monday. Sure, here's the translation:

"But I still tapped on the interface."

"On a VW A3 8L 1.6, I was able to read the data from the pump, but not from the engine control unit (ECU). I was able to access the system, but I couldn't retrieve any data." I received the message "no error codes found, not supported, or an error occurred." Also, the Climatronic system in my A6 is now sometimes displaying the same message.

bastion wrote:

On a 1.6 A3 8L, I was able to read the pump data, but not the engine control unit (ECU).

Normally, when working with an interface that doesn't have automatic baud rate detection, you need to manually set the baud rate, and then it should work with these 1.6L engines.

bastion wrote:

I was able to get in, but I couldn't extract any data. I received the message "no error codes found, not supported, or an error occurred."

I can't understand it. I've used a PCI-KKL interface without any problems for a long time, and I've even had more than one Audi central locking pump connected to it... Still, it's possible that something isn't right. As I mentioned before, it's best to contact the manufacturer directly, and you'll likely receive a specific answer from them.

bastion wrote:

Also, now the Climatronic system in the A6 sometimes starts displaying the same message.

The Climatronic control units can sometimes be a bit slow to respond, and unfortunately, issues like that can occasionally occur. This often happens, especially after starting the engine, when the control unit's self-test has not yet been completed.

Okay, I just went to the dealer. He also doesn't support the ZV STG. Apparently, there's a fault (possibly a loose connection) in the K-line, or the control unit is damaged.

I read on a4-freunde.de that the diagnostic function is only supposed to be supported from the model update.

bastion wrote:

Okay, I just went to the dealer. He also doesn't use the ZV STG. Apparently, the K-line

has a fault (possibly a loose connection) or the control unit is damaged.

So, basically, what I said from the beginning... but it's always the diagnostic hardware's fault...

bastion wrote:

I read on a4-freunde.de that the vehicle's diagnostic function is only supposed to be supported from the model update.

A 1996 model should still be capable of being diagnosed.