No Connection to Tax Devices

Hello everyone in the forum,
I went to DEKRA for a main inspection and noticed that the auxiliary heater wasn't working.
Connected VCDS to unlock the ZH function, but unable to connect to the control unit. A scan was performed. The scan indicates that UDS error code information is only supported by the current hardware generation. The Touran will be 3 years old tomorrow. I would be very grateful for your help. Have a nice weekend, Wolfgang.

For many vehicles, the auxiliary heater cannot be accessed with VCDS, but rather through software provided by the manufacturer.

Hello Ruedi,
Thank you for the response. I can't access the "ZH" (likely referring to a specific menu or setting) or the battery settings. However, it works on the T6 model from 2017. Best regards, Wolfgang.

Hi Wolfgang,
Your Touran is likely a 2018 model year. Which VCDS interface are you using? It's probably not possible to do much without the HEX-V2. Have you been able to do anything else with your interface on this car before?
hg
Herbert.

Hello Herbert, thank you very much for your reply.
"I purchased a VCDS workshop diagnostic kit from Rainer in November 2016 and I am very satisfied with it. This is the first time I'm using VCDS on my Touran. Please tell me which VCDS version I should buy, and I will order it from Rainer. Thank you for your help. Best regards, Wolfgang."

Hi,

If auxiliary heaters or parking heaters are installed from the factory, they are also integrated into the vehicle's diagnostic system.

If you can access other control units, I would first check the fuses, cables, and connectors responsible for the auxiliary heater. Occasionally, the control unit itself may also be defective.

If no control unit in the vehicle is accessible, I would test the function of the diagnostic cable on a different vehicle.
If it works in one place, there's often a pin that has slipped backward in the diagnostic connector of the problem vehicle.

You can also perform the interface test within the VCDS program settings.

Best regards, Rainer.

Hello Rainer, thank you for the reply. The ZH is standard equipment.
"Installed, but cannot access the control unit. Please see the scan data."
Merry Advent, Wolfgang.

Hello Rainer,
Ash on my head. The Touran doesn't even have a sunroof, although the salesperson told me three years ago that it was standard equipment.
I don't drive the Touran myself, and yesterday I was surprised that it takes so long to warm up. Also, when turning off the engine, I didn't hear the usual sound of the water pump running after. I thought the water pump might be locked, and I wanted to unlock it using VCDS. But you can't read out what isn't installed. Sorry, Merry Christmas! - Wolfgang

Schmierpfote wrote:

The Touran doesn't have any built-in navigation, although the salesperson said 3 years ago that navigation was standard equipment.

Sure? At least in the auto-scan, address 18 was attempted.

Your vehicle therefore believes it has a sunroof/moonroof. Someone must have entered this information into the control unit configuration (module 19) at some point. Either VW installed it from the factory because it's actually present, or someone may have tinkered with it using VCDS.

Okay, could you open the hood and check if there's a Webasto sticker on the engine cover?

Hello Guste,
Thank you for the reply. I checked the car and couldn't find any damage from the engine compartment side, specifically near the right front wheel.
"When the Touran is back this evening, I will take a look at the castle wall. Thank you, and have a good week." - Wolfgang.

I'm surprised that address 18 wasn't recognized in the initial vehicle scan. Also, I can't imagine that the Touran doesn't have a supplementary heater. As mentioned before, please check the sticker on the locking carrier and look for an exhaust pipe on the left side.

Hello VAG-Driver,
There is no Webasto sticker visible on the chassis.
The ZH (presumably a sensor or component) is located on the right side of the Touran, behind the wheel arch liner and in front of the right front wheel. Thank you for your help. Wolfgang.

How did you realize that the auxiliary heater (ZH) wasn't working? The auxiliary heater is essentially a modified version of the main heating system (STH) that cannot be operated manually.

I'm still puzzled by the fact that address 18 appears in one car scan but not in another.