VAG COM: Baud rate synchronization failed...

Hello,

I occasionally encounter problems with my VAG-COM, and specifically, while I can access all the control units in my Ibiza, I can't access one particular one:

Combination instrument, immobilizer, central locking.

The error "could not synchronize baud rate" always appears, see the attachment.


Control units such as automatic climate control, the engine, and ABS function without any issues.


Do you have any recommendations? Is VAG COM 311.3-S a full version, and is it a branded interface, not some cheap junk from eBay? It's quite old equipment, salvaged from a former workshop, and I'm just using it privately now because it's sufficient for my home use.

With the brand new 704 diagnostic tool in the workshop, I can access all the control units... but not with mine, and I suspect I need to change something in the settings.

I've tried start baud rates from 240 to 9600, as well as the standard value of "0".


What can I do with the remaining values, as detailed in the attached document?


And please, just to reiterate: Yes, I know this stuff is old, but it's sufficient for my needs. And as far as I know, it used to work on older operating systems. But since I got the Ibiza, it somehow doesn't work anymore, and I can only use it with my own hardware/software.


Greetings.
Georg.

Does your PC have a "real" COM port?

no.

ACER Aspire laptop with a Pentium dual-core processor and USB ports, connecting everything through a USB-to-RS232 interface. "It used to work, but I haven't done anything with it for years. I've just been testing things out lately, and even tried accessing the instrument cluster for customer service purposes - but nothing worked..."

Are there perhaps better USB-to-serial port converters available that work reliably? Mine is from Hama...

Ibiza1986 wrote:

... It used to be different. ...

It even depends on the specific "counterpart" device being used. So, the STG (System Terminal Gateway) you're referring to is working, but another (identical) one isn't. USB-to-serial converters are simply too sensitive to signal timing. It doesn't work 100%.
I used to work with a converter for a while, but I quickly switched to a USB interface.

Hi,

I'll try buying and testing another COM-to-USB converter from Conrad tomorrow, just to see if that helps. If none of this works, I'll just throw everything away and buy a second interface.

Since I was interested in working on both the dashboard (Tacho) and the vehicle control unit (ZV), I really wanted to get involved – the dashboard for customer service, and the vehicle control unit for programming.

If you absolutely want to play around with another transformer...
If you want to do something, try to get one with an FTDI chip.
They have been very compatible with me so far, and will be (or were?).
directly distributed by some VCDS distributors.

Best regards, Micha.

Hi Wiesel,

Thanks for the tip. I was actually looking at this one because it's designed to be inserted in between existing cables and wouldn't require any additional cables, which is something I wanted to avoid.

According to the information he provided, the device also uses an FTDI chipset.

The link ends with the error message: "Error, the shopping cart could not be created."
Article number?

Oh.

always the same thing with Conrad links...

Okay: www.conrad.de >>>> 971791 - 62


Greetings.
Georg.

That should work (otherwise, you'll only have the option of using a PCMCIA 232 card or...).
hold a USB VCDS interface).

Best regards, Micha.

hi,

Okay, it's not about the 10 euros, and since I'm going to Conrad anyway tomorrow, that's a good option... I'll let you know .

I'll set the start baud rate back to "0" for automatic, I think.

Conrad didn't have the adapter in stock.

Does anyone have a COM-to-USB converter they're not using?