Webasto Diagnostic Adapter

hi,
I want to use the VAGCOM adapter and the Webasto software to read out my Webasto Thermo Top E.
Unfortunately, it doesn't work with the adapter (which has 3 optocouplers and 3 potentiometers).
With Bosch, it worked immediately and within seconds using the original Webasto adapter and both my laptop and theirs. Unfortunately, it cost 17 euros.

Has anyone used a VAGCOM adapter to read out data from a Webasto unit?
if so, then with which adapter?

Is there a wiring diagram available for the original Webasto adapter anywhere?
greetings

Hi,
With Maik's adapter, it wasn't a problem. I'll try Ulf's adapter sometime in the next few days, if I have the chance.

hi,
Okay, I'll build the adapter and try it out when the Webasto unit is returned from Webasto.
While reading the diagnostic data with Bosch software, there was a really cool and revolutionary error message displayed:
'Flame detected due to fuel supply.'
That would be very efficient if it also produced heat.

Diagnosis from the Bosch technician:
Control unit defective!

Since the unit was only installed 2 months ago and was working properly (manufactured in 2003), the Bosch technician told me that a new control unit or even a completely new Webasto heater would be available under warranty.
And now it's already at Webasto.
greetings

@PowerSound3L
"I had the exact same problem with my ThermoTop C. And I received the exact same response from Bosch when I asked what could be causing it. HOWEVER, THAT WASN't THE PROBLEM. It was just the glow plug that was faulty, as it's also used as a flame sensor in both the ThermoTop E and C (due to low resistance, it detects a flame even when there isn't one). I replaced it with a used one, and everything started working again."
Your problems with the diagnosis are strange. I also connected my VAGCom adapter, and it worked immediately. The connection is even much more stable than when I connect the adapter to my MSG.

/Jan

Hi,

Today I briefly connected an optocoupler adapter, I think it was version 2.3 from Ulf, and couldn't get it to work. However, I didn't have time to experiment with the potentiometers.

hi,
Today, the Webasto heater came back (I had sent it in to Bosch for repair).

Unfortunately, I didn't receive a new one.
It seems it was indeed just the glow plug as described above. It looks like only the glow plug has been replaced. The connector now has the inscription '2/04,' which means February 2004, so it must have been replaced then.
It's working in the car again.

Although it was a part purchased from eBay and installed by myself without an installation stamp from a workshop, the repair was still covered under warranty.

In total, it cost me 17 euros for the diagnostic scan at Bosch and 7.50 euros for shipping.

greetings

@PowerSound3L

"Why are you getting so worked up? You probably got a whole new burner too, because you can't buy the glow plug separately. That should be the part that wears out most quickly on the heater. Mine is starting to give out; it's smoking and doesn't have much power left. You won't need to replace it for at least the next few years."

best regards
January.

hi,
Okay, the MAIKs adapter works perfectly fine.
However, I built a minimal version, just the K-line without the potentiometers and LEDs.
greetings

Has anyone ever tried using a large, original HEX-CAN USB interface with this software? Does it work with that type of interface, or is it only designed for serial connections?

vagtuning wrote:

Has anyone ever tried using a large, original HEX-CAN USB interface with this software to see if it works properly?

It should generally work as well, especially if it functions with a simple or basic interface.

vagtuning wrote:

Or is this only designed for serial use?

In principle, yes, but there are ways and means...

hey freax

I've tried using several different ISO adapters to read data from my Thermo Top C.

hi,
Okay, the MAIKs adapter works perfectly fine.
However, I built a minimal version, just the K-line without the potentiometers and LEDs.
greetings

I'm new to this forum and just starting to learn about things like 'Maik's adapter' and 'Jeff's interface.'
Could you please clarify something for me?
From what I've gathered, it only works with a specific setup.
Why? I don't know...

A schematic diagram or assembly instructions would be helpful.

'Thank you in advance!'

'Best regards,' or 'Sincerely,' (depending on the context).
Tom.

Take a look inside.
I'm sorry, but I cannot access external websites or specific files online. Therefore, I am unable to translate the text from the provided URL.

I am using version 2.4 of Ulf. However, it only works for me with the DOS version (which has a much smaller feature set and no logs, etc.).

hey!

Thanks for your reply!
I was on the website and read everything again.
I couldn't find any information about an adapter from Maik.
I would also like to know what the differences are.
It provides the same functionality as a conventional ISO adapter.

It's really tedious to install Thermo Test Software 2.07 on Windows 98.
Getting it to run and then also dealing with the adapter problems.

Thank you in advance for your help!

'Best regards,' or 'Sincerely,' (depending on the context).
Tom.

Hello PowerSound3L,

Even though an explanation might now be obsolete, the reasoning seems quite simple to me:

It seems like you are using a USB adapter.
The problem is that the TT device from Webasto communicates with standard automotive K-line devices using the standard baud rate (the speed at which data is transmitted), according to the ISO standard (I won't go into detail here).

This baud rate cannot be generated using the standard rates used by USB devices. This means it deviates slightly, which prevents communication from occurring.

While Webasto also offers a USB adapter, it generates the baud rate itself.

Either your PC has an RS232 interface, in which case you can build the interface described here (it doesn't require anything special), or you can purchase the Webasto adapter, but that is not exactly cheap.

Commonly used USB to RS232 converters also do not work for the reason mentioned above!

However, there are no issues with the newly developed Webasto heaters, which are referred to as "W-bus" devices in the device selection.

Hope I was able to help you.

Best regards, Atze.

...or use this instead:
[Edit: http://shop.dieselschrauber.de/product_info.php/products_id/59 is no longer current. Diagnosis is possible via the K-line and professional system: http://shop.dieselschrauber.de/index.php/cPath/23]

Rainer K. wrote:

...or use this instead: http://shop.dieselschrauber.de/product_info.php/products_id/59

Does the Webasto software also work with the VAG-COM/OBD2 diagnostic professional system KKL+CAN?

"If so, which connector (OBD 2x1) should the yellow wire from the Webasto be connected to? Should it be connected to the black or gray one?"