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I have failed for the following reason - No display zone with Zone 1 HVAC is activated at group 058. I dont have the comfort HVAC module (3 zone). Display group number 058
Display zones 1 … 4
Information on ambient air quality and on automatic recirculated air function received from data bus system.
- The air quality sensor -G238- is connected to the onboard power supply control unit -J519-. The -J519- converts the information into data signals and sends them over the data bus system to the Climatronic control unit -J255-.
- The display zone is only assigned for a comfort air conditioner. With a basic air conditioner no air quality sensor -G238- is fitted.
J Display zone 1: Air pollution measured by the -G238- (at readout 00 no air pollution is measured).
J Display zone 2: Preset sensitivity of the -G238- (the basic setting 2 can be changed depending on the Climatronic control unit -J255- via the adaption function in adaption channel 28).
J Display zone 3: NOx (nitrogen oxide) content in air measured by -G238-.
J Display zone 4: CO (carbon monoxide) content in air measured by -G238-.
J The measured values of the air quality sensor -G238- are indicated in the measured value block of the onboard power supply control unit -J519- (CU 09 measured value blocks 73 and 74).
If there is a way to enable display zones, then this should be done by a programming expert who will charge for this activation.
My project comes to an end. Not working unless 3 zone HVAC is also retrofitted or an add on parameter is offered by a diagnostic (e.g. Vag Can Pro). Should be easier for me to upgrade to 3 zone (I think I will take the risk)
This info was more of an academic type/a research project.
Last edited by apoelistas; 12-02-2018 at 08:28 AM.
I was interested for the same retrofit, also for the fact that I changed the FL panel -(3 zones) - and now the first error is related to this G238 missing sensor.
As a workaround until I will figure it out - I installed the supplementary filter that is used for Mexic & China only due to the massive polution - cabin filter for 2009 Audi A4L 2.0L / B8 Air-conditioned OEM:8KD819441.
I was interested for the same retrofit, also for the fact that I changed the FL panel -(3 zones) - and now the first error is related to this G238 missing sensor.
As a workaround until I will figure it out - I installed the supplementary filter that is used for Mexic & China only due to the massive polution - cabin filter for 2009 Audi A4L 2.0L / B8 Air-conditioned OEM:8KD819441.
Very detailed write up! Great work! Thank you
You are welcome. Nice to see that the information I have posted is of help to someone else apart from me
Please in the future post your codings in order to solve the 3 Zone sensors errors (upgrade from 1 zone)?? You are one step ahead of me. It was a pity to find out that the HVAC 1 zone does not support air quality sensor.
Will order mine in Christmas time, (need to fix my rear door not locking when cold first) but did not decide if I should get a facelift or the prefacelift 3 zone version. I think there are some graphical visual differences. Prefacelift will be easier to code.
Last edited by apoelistas; 12-02-2018 at 01:41 AM.
I just replaced the FY - and just start to identify someone that made the retrofit from 1 zone to 3 zones ... so please find below the errors that now I have on the address 08::
Address 08: Auto HVAC (J255) Labels: Redir Fail!
Part No SW: 8K1 820 043 N HW: 8K1 820 043 N
Component: KLIMA 3 ZONEN H04 0036
Revision: C1000000 Serial number: 01130420120604
Coding: 3402000000
Shop #: WSC 00415 143 12717
VCID: 33649FE2929275D218-8066
12 Faults Found:
01592 - Air Quality Sensor (G238)
004 - No Signal/Communication
Freeze Frame:
Fault Status: 01100100
Fault Priority: 6
Fault Frequency: 1
Reset counter: 161
Mileage: 158804 km
Time Indication: 0
Date: 2018.10.30
Time: 15:16:49
Freeze Frame:
Temperature: 25.0°C
00359 - Left Front Upper Body Outlet Temperature Sensor (G385)
010 - Open or Short to Plus
Freeze Frame:
Fault Status: 01101010
Fault Priority: 3
Fault Frequency: 1
Reset counter: 161
Mileage: 158804 km
Time Indication: 0
Date: 2018.10.30
Time: 15:16:49
Freeze Frame:
Temperature: 25.0°C
Speed: 0.0 km/h
Voltage: 11.80 V
00360 - Front Right Upper Body Outlet Temperature Sensor (G386)
010 - Open or Short to Plus
Freeze Frame:
Fault Status: 01101010
Fault Priority: 3
Fault Frequency: 1
Reset counter: 161
Mileage: 158804 km
Time Indication: 0
Date: 2018.10.30
Time: 15:16:49
Freeze Frame:
Temperature: 25.0°C
Speed: 0.0 km/h
Voltage: 11.80 V
01231 - Right Footwell Vent Temperature Sensor (G262)
010 - Open or Short to Plus
Freeze Frame:
Fault Status: 01101010
Fault Priority: 3
Fault Frequency: 1
Reset counter: 161
Mileage: 158804 km
Time Indication: 0
Date: 2018.10.30
Time: 15:16:49
Freeze Frame:
Temperature: 25.0°C
Speed: 0.0 km/h
Voltage: 11.80 V
03037 - Rear Temperature Selection Potentiometer (G538)
010 - Open or Short to Plus
Freeze Frame:
Fault Status: 01101010
Fault Priority: 3
Fault Frequency: 1
Reset counter: 161
Mileage: 158804 km
Time Indication: 0
Date: 2018.10.30
Time: 15:16:49
Freeze Frame:
ON
Voltage: 11.80 V
Voltage: 4.90 V
00712 - Right Footwell Flap Positioning Motor (V109)
008 - Implausible Signal
Freeze Frame:
Fault Status: 01101000
Fault Priority: 3
Fault Frequency: 7
Reset counter: 162
Mileage: 158804 km
Time Indication: 0
Date: 2018.10.30
Time: 15:16:50
Read following 1 and 2 and try to understand and report after testing. some settings are for facelift HVAC. You have to enter coding you had for 1 zone, I believe. Then if your HVAC 3 zone is from facelift and your car was prefacelift you add 00 at the end. Then you do corrections as below + corrections for Air quality sensor.
If that works please let us know. Hope it does because I have no other info to fix the issue. Ordered a FL HVAC 3 zone too but without heated seats option.
1.
Anyway, here is the correct coding:
- Enter Address 08: Auto HVAC (J255) - Select coding (don't use the longcoding helper yet)
- Copy the coding from the old airco unit to the new one. (Copy it from a vcds scan) - Then go to Byte 1, bit 4 (deselect MMI 3G display) Go to Adaption:
Channel 79: change from 1 to 0. This changes the LIN-Bus from the blower unit from new to old generation. This is why the fan control speed doesn't work as many people describe.
Channel 35: change 0 to 1 if no humidity sensor is installed.
Channel 85: change from 0 to 1 (VFL/FL related) Now the unit will work okay and will generate no errors. Side effects: You lose the visual presentation on the center display if you have Radio Concert/Chorus or MMI 2G. Your seat heating has instead of 6 just 3 settings. Not a very big problem. 3 is the equivalent of 6 warmth wise. If you have MMI 3G it will function 100% correctly (so with the full visuals) but then skip "Then go to Byte 1, bit 4 (deselect MMI 3G display)" And ofcourse you need the CP removed with a VAS connection.
2..
I did the adaptation for the 1-zone climate control on A4 B8 as it is described above, I copied the coding from the old non-FL one to the new FL-one and then did the adaptation on channel 79 and it works like a charm. btw the old coding had only 4 bytes and the new one needed 5, so for the last byte I just coded it to 00: 64020000 -> 6402000000. I have symphont radio so I didn't lose the visual presentation (skipped this step "Then go to Byte 1, bit 4 (deselect MMI 3G display)")
The problem with HVAC is that we don't have the security access code.
Last edited by apoelistas; 11-11-2018 at 02:37 PM.
Wait, Mexico and China get super air filters, and we can't even get pine-scented ones in the US?
We're being sold cars with inferior air filters?
Oh, I must tell Donald about this. He's not going to like hearing that America is getting inferior German cars.
I just replaced the FY - and just start to identify someone that made the retrofit from 1 zone to 3 zones ... so please find below the errors that now I have on the address 08::
My tests and my faults after coding.
The main problem I had is that there is no HVAC display working (HVAC screen does not light up). Is this part of component protection?? Anyone to confirm this? e.g. If I remove CP will HVAC screen light up? I can live with the faults if HVAC will be fully functional.
Could not perform any basic settings (most probably due to missing components temperature sensors and flap actuators). A pain to replace these.
@mgbyte do you have the same problem?? @spijun any experience with this?
Tests showing that Air Quality Sensor is fully supported:
Faults after coding:
Address 08: Auto HVAC Labels: NONE
Control Module Part Number: 8K2 820 043 BA HW: 8K2 820 043 BA
Component and/or Version: KLIMA 3 ZONEN H04 0122
Software Coding: 6405000000
11 Faults Found too from missing components.
Last edited by apoelistas; 12-02-2018 at 11:13 AM.
10-20-2018, 06:16 AM
