Location of Comfort Control Unit, Passat 3BG

Hello everyone,

'After my ESP/switching panel issues were resolved (which apparently stemmed from a new but still defective distance sensor), the comfort control unit is now malfunctioning. It doesn't register during diagnosis with VCDS, the interior lighting doesn't work, the window lifters are dead, etc. When diagnosing the switching panel, error code 01336 'Group data bus comfort 80-10' appears in single-wire mode.'
My question: Where does this part go now? Under the rear seat?

Hi m3_bremse,

I'm not entirely sure about the Passat, but for example, in the Golf IV, the part is located in the driver's side door. If you're not getting any more reliable answers here, just take a look under the door trim.

Hi,

So, I did some research. The control unit is supposedly located somewhere under the driver's seat in the Passat.

Hello, in the Passat, the comfort control unit is located under the carpet in front of the driver's seat.

It's really great to get involved in that!

And inside the doors are the door control units!

Good evening.

Thank you, I found it exactly where you described, under the carpet in front of the driver's seat. And, as suspected, it was wet. A true masterpiece of German engineering! I took it out, carefully dried it with a hairdryer, dried the rest, and reinstalled it. So far, the part seems to be working. The window lifter and interior lighting are working perfectly. However, there are two things:
- The error memory shows two errors: 01336, 'Corporate data bus, comfort, 80-00, single-wire operation,' and 01141, which unfortunately doesn't have a text description because it's from the shareware version of VAG-COM.
- Secondly, the remote key fobs are no longer working (i.e., the remote control).

Should I perhaps re-pair the radio keys?

Yes, I've also re-coded the comfort control unit before, using the code and workshop code that were available.

'Ich habe keine Ahnung, was ich tun soll.'
'I have no idea what to do.'

Sure, here's the translation:

'Anything else?'

Assuming I want or need to replace the comfort control unit:
What needs to be done when installing a brand new [component/device]? Just the code and workshop code from the old one, and then coding or something else? What else should we consider?

Good evening,

Thank you, I found it exactly where you described, under the carpet in front of the driver's seat. And, as suspected, it was wet. A true masterpiece of German engineering! I took it out, carefully dried it with a hairdryer, dried the rest, and reinstalled it. So far, the part seems to be working. The window lifter and interior lighting are working perfectly. However, there are two things:
- The error memory shows two errors: 01336, 'Corporate data bus, comfort, 80-00, single-wire operation,' and 01141, which unfortunately doesn't have a text description because it's from the shareware version of VAG-COM.
- Secondly, the remote key fobs are no longer working (i.e., the remote control).

Should I perhaps re-pair the radio keys?

Yes, I've also re-coded the comfort control unit before, using the code and workshop code that were available.

Any Ideas?


Hi m3_bremse,

Don't you think that if your car has already been flooded to some extent, there might be moisture in other places as well? Regarding the remote keys, try the normal pairing process, like after a battery change. The instructions on how to do this are in your car's owner's manual. If that doesn't help, here's another guide from Michael II:

Vehicle types: 1J, 3B, 6E, 6N, 6X.


- Insert the mechanically matching ignition key into the ignition switch.
- Turn on the ignition.
- Select the 'Function Adaptation' option in the diagnostic system.
- Select channel 00 and acknowledge (all learned keys will be deleted).

Sure, here's the translation:

'Note:'
Without deleting the previously learned keys, it is not possible to create a new or additional set of keys.

- Select channel 01.
- Channel value: Press the '0' button four times, then enter the total number of keys to be programmed, including any existing keys (e.g., 00003); a maximum of 4 keys can be programmed.
- Save the modified value.
- For each radio key to be learned, at least one button must be pressed for a minimum of 1 second (in the example above, this applies to 3 keys).
- Turn off the ignition and remove the key.
- Perform a functional test of the (e.g., 3) radio keys.

Sure, here's the translation:

'Note:'
All 3 keys (see example) can be learned during a configuration process.

When adjusting all keys (pressing a key), the time taken must not exceed 15 seconds.

A successful adjustment can be verified using the 'Read measurement block' function 08, display group number 013. When the radio key is activated, the first two measurement values should indicate 'OK' status. At the same time, the last measurement displays the position of the key (first, second, third, fourth key).

If the remote control key is pressed multiple times, the third indicator, which initially displays 'no reading,' will change to 'O.K.'

The key personalization process will automatically stop when:

* the number of keys to be adjusted has been reached.
* A button on the radio key being learned is pressed more frequently.
'The permissible adjustment time of 15 seconds has been exceeded (an error is recorded).'

- Select function 02 'Query fault memory'. If no errors are stored, the key adjustment has been successfully completed.
- Turn off the ignition.


Please provide the German text you would like me to translate.
Goodbye.

Michael II.

@Marco

'The humidity could be the issue! But I'm not sure where else. The fuse box module shows the error, and so does the comfort control unit! And the fuse box module is located elsewhere. If I understand correctly, the connection problem refers to the CAN connection. Actually, the ABS/ESP should also communicate via CAN, but there's no error there. By the way, is the receiver for the remote control integrated into the central comfort control unit, or is there a separate module?' 'If so, where can I find it?'

Sorry for the silly questions!

The receiver is integrated into the comfort control unit.

'When a button on the key fob is pressed, is the code also checked by the immobilizer? If so, that could be the problem! No communication with the immobilizer means no remote key fob functionality?! The pairing procedure according to the manual doesn't work.' I'm going to try MichaelII's method tomorrow!

Okay, here's the translation:

'Again: If I replace the engine control unit (ECU), what do I need to be aware of? It's clear that the entire key needs to be reprogrammed! And what else, besides the possible need for...' Encoding?

Hi,

How did you manage to drain that thing?

Just using a foen (a type of hair styling tool) isn't enough. Search the forum; there was a message group (MSG) that was flooded with messages, and that thread contains a lot of information about the question. The conclusion was that the best way to dry a circuit board is to place it in an oven at 50 degrees Celsius for 24 hours.

That might be your problem.

Best regards,

Jan.

Hmmmmm...

I know that article. But do you think it's useful? What is the probability that everything else works fine, but the radio receiver or the CAN interface doesn't?

Hi m3_bremse,

I'm not entirely sure, but I believe the radio component of the key has nothing to do with the WFS. I would first make sure that the inside of the car is completely dry, and then I'll see what else needs to be done.

Hello.

Okay, I found the problem! It was a cable connected to the comfort control module that probably came loose during the disassembly. Therefore, the occasional problems I observed with the remote control are likely due to that.
The communication for the circuit breaker deployment is working again. Since I can't find this line anywhere in the circuit diagrams, I suspect it was either +12V or the CAN line. But it's probably some kind of operating voltage. *wipes sweat*

I actually know the cause of the water leak! It was an angry 'window cleaner' at a gas station, to whom I politely explained that I didn't want any window cleaning. Unfortunately, I hadn't locked the car while paying, so the guy emptied a bucket of water into the driver's side footwell! Thankfully, there's a witness who contacted me earlier (thanks to the website address on the rear window). I will show up there on Monday and have a little chat with the boss!