I have the same issue, the v401 won't link with the air-con ecu, I haven't updated firmware either. I have another handheld that will communicate with air-con and can clear codes bit I think the sensor needs replacing I'll update once sensor done. Cheers
Webasto fault-free but doesn't run
- Thread starter Robin_Cox
- Start date
So, the webasto mission continues. The G263 sensor has been changed to clear all fault codes from the aircon system, and there are no fault codes displayed from the webasto. This morning it was 1degree c so plenty cold enough to fire up, but nothing happened when engine started..Aircon set to HI and not on ECON. So i tried again using the 022 method with the v401 to start / test the webasto. It fired up straight away. What i found was if i started the webasto using the v401 with engine running then turned off engine and exited the v401. the webasto would go into cool down mode - ie fan still going but no heat being produced. if i restarted the engine whilst fan still running the webasto restarted. if i left it until the fan stopped the webasto won't auto restart when engine restarted. i read somewhere that the type / version of climate panel may be important - in my car the panel has probably been changed since original - could that cause an issue? any other things I could check? Thanks for any suggestions.
Edit - one question. You say that you have changed the G263 'to clear the fault codes' from the a/c system : but you haven't said that you have cleared the fault codes from the a/c ECU. In my hands, this was critical - my webasto (as yours) was fault-free : it took plugging in the laptop, accessing the a/c ECU and repeatedly clearing until there was only the a/c pressure sensor fault left that resulted in the Webasto working trouble-free : just replacing a dud sensor does not necessarily clear the ECU error remaining from before.
Excluding my addition above - if I was going to guess, my guess would be that the a/c panel has one of those 5 digit (decimal) binary-converted codes that specify how it is set up (in the same way that you can tell the car that it is in Germany and needs speeds/distances in km). If you fit an a/c unit that was used to having an electric heater and no Webasto into a Webasto-fitted car, it will have the wrong bit codes in that particular data point, so it doesn't know to switch it on - so it should suffice to recode it.
However - how to establish this - and then recode it - is well beyond my A2 level. I presume and hope that more knowledgeable folk will be along soon while I do some reading to see if I can come up with a better answer from the workshop manuals.
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Thanks Robin, I erased all fault codes from A/C ecu using handheld reader, I'll double check with VCDs and computer. Yes that is what I was wondering about with the climate control panel, it may well be from a later version that had electric heater..interested if anyone knows how to check coding. cheers
audifan
A2OC Donor
If it helps my climate panel is part number 8Z0820043D, it is a 1.4 tdi 75 with 1500W electric heater and no rear parking sensors. There appears to be 2 part numbers for the climate panel without electric heat seating and 2 with electric seat heating. Have you checked the part number of your climate panel?
thanks for the part number, i'll check to see what mine is and get back - probably on friday... cheers
audifan
A2OC Donor
@nod have you read this thread to its conclusion. Looks like the climate panel is the key...
www.a2oc.net
Although whether part number specific or just a fault not sure......?
??
How can i check if webesto heater is working
Good evening can anyone please advise me how to check if my webesto heater is working as it did not switch on this morning at 5 deg i thought it would.
www.a2oc.net
Although whether part number specific or just a fault not sure......?
??
Looking at the option codes for the Climatronic units (as opposed to the manually-selected ones), D, E, F and G suffixes are defined as those with and without heated seats, in single and double-DIN versions that impact on the casing of the front plate - none of them definitively Webasto / electric heater. This to me suggests it is a coding or adaptation thing - need to look at what 5-digit bitcodes are present on my Webasto-enabled versus my non-Webasto in case this affects the situation. Was being daft - have never even thought of this before. Need to fetch out the VCDS-lite laptop.
4A0 = Without seat heater
4A3 = Seat heater for front seats separately controlled
7Q0 = Without navigation device
7Q2 = Navigation system with color screen
7Q9 = Navigation system
8AA = Without radio
8AY = Radio/navigation system
8UB = Radio preparation
8UC = Radio "chorus"
8UM = Radio "symphony" (ECE)
8UQ = Radio "concert" for USA
9AK = Climatronic with impact pressure control free of cfc
Thanks both, may well try swapping out for a known good webasto climate unit. looking at label on climate could the numbers circled be coding for webasto/non webasto?@nod have you read this thread to its conclusion. Looks like the climate panel is the key...
How can i check if webesto heater is working
Good evening can anyone please advise me how to check if my webesto heater is working as it did not switch on this morning at 5 deg i thought it would.
Although whether part number specific or just a fault not sure......?
??
No idea I'm afraid. I've just checked my two A2 Tdis - one with and one without Webasto. They both have a D-suffix Climatronic unit as yours above and I hoped to be able to identify a coding difference that might be useful. Unfortunately, on my VCDS (very) lite it only tells me the part number and the fact it is a climate control unit ; everything else is greyed out as an option and there is no coding information. Such a shame that VAG401 doesn't communicate with Climatronic.
2work
Well Known Member
Morning Robin,
I’ve been following this with interest regards the potential requirement of a specific climate control unit, as I too am yet to have the Webasto kick in when cold enough outside.
I have no faults and the glow plug is working as I managed to engulf the front of the A2 in plume of smoke during the output test. Only getting cold air from the exhaust during the basic setting 022 though. Must be a fuelling issue elsewhere., more investigation required I think.
Nothing new to add to the thread apart from I have full VCDS and I also don’t have the ability to check coding of the climate control unit, it’s greyed out. I’m guessing there is no coding possible based on my few attempts last night.
Kind regards,
Tom
Proghound
Admin Team
Since I (OK, my garage 
) got my Webasto working on my Crystal A2, it has been converted first to double-DIN and then to heated seats. So it's now on its third different climate unit and has done at least one winter on each one. The Webasto has fired up every time it should, even when using a climate unit that came out of a 1.4 petrol A2
So I don't think there's any difference between the various climate part numbers in their capability to control a Webasto. When it decides it needs aux heating, it activates the aux heater if there's one fitted, whichever type that is. I suspect the different part numbers relate to hard vs. soft touch, single vs. double-DIN, heated seats vs. none.
) got my Webasto working on my Crystal A2, it has been converted first to double-DIN and then to heated seats. So it's now on its third different climate unit and has done at least one winter on each one. The Webasto has fired up every time it should, even when using a climate unit that came out of a 1.4 petrol A2 So I don't think there's any difference between the various climate part numbers in their capability to control a Webasto. When it decides it needs aux heating, it activates the aux heater if there's one fitted, whichever type that is. I suspect the different part numbers relate to hard vs. soft touch, single vs. double-DIN, heated seats vs. none.
Found this in the workshop manual which seems to confirm Tom's conclusion that the climate panel is not coded - but appears to act as a gateway to transmit a signal which activates the Webasto
That would explain why a replacement climate panel allows the Webasto to function again
Cheers Spike
That would explain why a replacement climate panel allows the Webasto to function again
Cheers Spike
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justin-20V
Member
It's still Webasto time of year, so thanks to Robin's post I've been having a play with mine too, but inconclusive results so far...
I had a couple of faults logged - the infamous G263 (I now have the sensor on order from Autodoc, looking forward to changing it obviously !...) and 01412 'implausible glow plug signal' on the Webasto which appears sporadically. Not sure if the G263 has any bearing on the Webasto working, but the a/c doesn't blow cold, so decided it's worth changing it for that reason alone.
Webasto wise, when I clear the fault on VCDS lite and run the x3 output tests I get the familiar glow plug smoke, pump noise and fan. I have tried the 022 basic setting test and the unit does fire, run and warms up nicely. I tried it with the engine off as I wanted to hear what was going on, but unfortunately when I have tried it with the engine running I could not get it to fire and the 01412 'implausible glow plug signal' fault comes back. But I haven't had a chance to try it again when it's stone cold with the fault cleared prior. I do suspect that although the main components are clearly working in some form, I think the glow plug probably needs replacing. I'm hoping if I can get it to fire a few more times I might be able to burn off/clean it in use, but i think that's probably wishful thinking !
If you have VCDS, try looking at measuring blocks channel 001 whilst in the heater controller as it shows the webasto state (start-up, run, malfunction etc) and you can also see the webasto temp sensor reading. Plus if you start/stop using the econ button, the state changes so you know the a/c controller is communicating with Mr Webasto and requesting heat !...
I had a couple of faults logged - the infamous G263 (I now have the sensor on order from Autodoc, looking forward to changing it obviously !...) and 01412 'implausible glow plug signal' on the Webasto which appears sporadically. Not sure if the G263 has any bearing on the Webasto working, but the a/c doesn't blow cold, so decided it's worth changing it for that reason alone.
Webasto wise, when I clear the fault on VCDS lite and run the x3 output tests I get the familiar glow plug smoke, pump noise and fan. I have tried the 022 basic setting test and the unit does fire, run and warms up nicely. I tried it with the engine off as I wanted to hear what was going on, but unfortunately when I have tried it with the engine running I could not get it to fire and the 01412 'implausible glow plug signal' fault comes back. But I haven't had a chance to try it again when it's stone cold with the fault cleared prior. I do suspect that although the main components are clearly working in some form, I think the glow plug probably needs replacing. I'm hoping if I can get it to fire a few more times I might be able to burn off/clean it in use, but i think that's probably wishful thinking !
If you have VCDS, try looking at measuring blocks channel 001 whilst in the heater controller as it shows the webasto state (start-up, run, malfunction etc) and you can also see the webasto temp sensor reading. Plus if you start/stop using the econ button, the state changes so you know the a/c controller is communicating with Mr Webasto and requesting heat !...