2011 Golf TDI Auxiliary heater won't start when it should

   #1  

Yourgis

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Hello everyone,

I drive 2011 Golf 2.0 TDI (CFHC), which have auxiliary heater (z35) installed as standard. The problem is it won't turn on naturally, never. I can get it work only by using bidirectional control (output test) for low and high heat output relays. Just to be sure, I checked the heater element, wiring integrity, no fault codes - everything is fine, except ECU won't commanding it on when it should.

According to ELSA, Z35 test condition are:
Intake air temperature less than 16C
Coolant temperature less than 80C
Passenger compartment temperature about 20C
Battery voltage greater than 11V
Alternator load not greater than 50%
Engine speed greater than 450 RPM.
Turn rotary knob for interior temperature to end position for maximum temperature.

And I'm sure that every single condition in that list is met, all the sensors are working fine.

I made an observation and took some measuring values samples from my and known good car, with exactly the same aux. heater system:
tolvY98.jpg


As you can see, in my car there is a "1" at he begging of the row in "Electric auxiliary heater: shut-off conditions Bit-0" parameter, which prevents auxiliary heater from turning on, despite that every single condition is met. I'm out of ideas how to solve this. What is the condition, which cause that "1" to appear?

The design of this system is super simple: two relays turning that heater element on and off. When necessary conditions are met, ECU provides ground to high or low heat relay control side and turns heater element on.

You can also find wiring diagrams below:
https://i.imgur.com/zNlmFOU.png
https://i.imgur.com/x3FbxAM.png

Autoscan:
Code:
Wednesday,28,November,2018,20:21:01:34902
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 7 x64
VCDS Version: 18.9.0.1 (x64)  HEX-NET CB: 0.4436.4
Data version: 20180927 DS296.0
www.Ross-Tech.com


VIN: WVWZZZ1KZBM653841   License Plate: GOLF6
Mileage: 235660km-146432mi   Repair Order: 



--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


Chassis Type: 1K-VW36 (7N0)
Scan: 01 03 08 09 10 15 16 17 19 25 2E 37 42 44 46 52 56 62 72 77
         

VIN: WVWZZZ1KZBM653841   Mileage: 235660km-146432miles

01-Engine -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
04-Steering Angle -- Status: OK 0000
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: OK 0000
10-Park/Steer Assist -- Status: OK 0000
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: OK 0000
25-Immobilizer -- Status: OK 0000
2E-Media Player 3 -- Status: OK 0000
37-Navigation -- Status: OK 0000
42-Door Elect, Driver -- Status: OK 0000
44-Steering Assist -- Status: OK 0000
46-Central Conv. -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
56-Radio -- Status: OK 0000
62-Door, Rear Left -- Status: OK 0000
72-Door, Rear Right -- Status: OK 0000
77-Telephone -- Status: OK 0000
-------------------------------------------------------------------------------
Address 01: Engine (J623-CFHC)       Labels:. 03L-906-018-CFF.clb
   Part No SW: 03L 906 018 AN    HW: 03L 907 309 R
   Component: R4 2,0L EDC   H22 9015  
   Revision: 42H22---    Serial number: 00000000000000
   Coding: 00190012042400080000
   Shop #: WSC 78387 152 12345
   ASAM Dataset: EV_ECM20TDI01103L906018AN 003008
   ROD: EV_ECM20TDI01103L906018AM_003_VW36.rod
   VCID: F6A09F40494FEBFA7C-80A2

No fault code found.
Readiness: 0 0 0 0 0 

-------------------------------------------------------------------------------
Address 03: ABS Brakes (J104)       Labels:. User\1K0-907-379-60EC1F.lbl
   Part No SW: 1K0 907 379 BE    HW: 1K0 907 379 BE
   Component: ESP MK60EC1   H31 0108  
   Revision: 00H31001    
   Coding: 143B600D092700FD281306E8901A0042350000
   Shop #: WSC 00066 123 12345
   VCID: F6A09F40414FEBFA7C-80A2

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC (J255)       Labels:| 5K0-907-044.clb
   Part No SW: 5K0 907 044 DT    HW: 5K0 907 044 DT
   Component: Climatronic   H17 1010  
   Revision: 00003001    
   Coding: 0000000002
   Shop #: WSC 00066 000 00149
   ASAM Dataset: EV_Climatronic A01010
   ROD: EV_ClimaAutoBasis_VW36.rod
   VCID: 804CF9981B8BD54A56-80D4

No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect. (J519)       Labels:. 1K0-937-08x-09.clb
   Part No SW: 5K0 937 086 J    HW: 5K0 937 086 J
   Component: BCM PQ35 M    011 0045  
   Revision: BC011001    
   Coding: 00180E3A882D02C040080080340081E447790088537D8140648000200040
   Shop #: WSC 00066 123 12345
   VCID: BB364E743AED769243-80EE

   Subsystem 1 - Part No: 5K1 955 119   Labels: 1KX-955-119.CLB
   Component: Wischer 23111  26  0512 
   Coding: 009795

   Subsystem 2 - Part No: 1K0 955 559 AH  Labels: 1K0-955-559-AG.CLB
   Component: RLS 081010 05  54  0403 
   Coding: 03302D

No fault code found.

-------------------------------------------------------------------------------
Address 10: Park/Steer Assist (J446)       Labels:. 3C8-919-475.clb
   Part No SW: 1K9 919 475 A    HW: 5K0 919 475 E
   Component: PARKHILFE 8K  H01 0004  
   Revision: --------    Serial number: 12591032319252
   Coding: 108003
   Shop #: WSC 00066 000 00000
   VCID: B93A547C30D1448251-80EC

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags (J234)       Labels:| 5K0-959-655.clb
   Part No SW: 5C0 959 655 C    HW: 5C0 959 655 C
   Component: AirbagVW10    012 0612  
   Serial number: 003G6D0395NZ  
   Coding: 00003536
   Shop #: WSC 00066 000 00000
   ASAM Dataset: EV_AirbaVW10SMEVW360 A01014
   ROD: EV_AirbaVW10SMEVW360.rod
   VCID: B2286350E5A7B7DA90-80E6

   Crash sensor for side airbag: driver side: 
   Subsystem 1 - Part No SW: 1KM 955 557     HW: 1KM 955 557 
   Component: S.Sens.Fahr.V  H01 ---- 
   Serial number: 3572MSME75604558ZZZX

   Crash sensor for side airbag: front passenger side: 
   Subsystem 2 - Part No SW: 1KM 955 557     HW: 1KM 955 557 
   Component: S.Sens.Beif.V  H01 ---- 
   Serial number: 3582MSME1A460258ZZZU

   Crash sensor for side airbag: rear: driver side: 
   Component: S.Sens.Fahr.H  --- ---- 
   Serial number: 3511HSME194B6324ZZZL

   Crash sensor for side airbag: rear: passenger side: 
   Component: S.Sens.Beif.H  --- ---- 
   Serial number: 3521HSME3C423C24ZZZO

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel (J527)       Labels:| 5K0-953-569.clb
   Part No SW: 5K0 953 507 BC    HW: 5K0 953 549 E
   Component: Lenks.Modul   007 0080  
   Revision: --------    Serial number:  90422JJJ000C4
   Coding: 1082140000
   Shop #: WSC 00066 000 00158
   ASAM Dataset: EV_SMLSNGKUDS A05001
   ROD: EV_SMLSNGKUDS_A05.rod
   VCID: F2A8A3502527F7DA50-80A6

   Multifunction steering wheel control module: 
   Subsystem 1 - Part No SW: 5K0 959 542 A    HW: 5K0 959 542 A  Labels: 3C8-959-537.CLB
   Component: E221__MFL-TAS  H07 0013 
   Serial number: 0132234             
   Coding: 820000

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments (J285)       Labels:| 5K0-920-xxx-17.clb-SRI1
   Part No SW: 5K0 920 871 AX    HW: 5K0 920 871 AX
   Component: KOMBI         H20 0420  
   Serial number: 00000000000000
   Coding: 171B01
   Shop #: WSC 06494 995 29333
   ASAM Dataset: EV_Kombi_UDS_VDD_RM09 A04089
   ROD: EV_Kombi_UDS_VDD_RM09_004_VW32.rod
   VCID: 8444F5880F93C96A72-80D0

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway (J533)       Labels:. User\7N0-907-530-V2.lbl
   Part No SW: 7N0 907 530 C    HW: 1K0 907 951 
   Component: J533  Gateway H37 0614  
   Revision:   H37       Serial number: 18111001210777
   Coding: 352002
   Shop #: WSC 00066 123 12345
   VCID: B02C6958E3AB85CAE6-80E4

No fault code found.

-------------------------------------------------------------------------------
Address 25: Immobilizer (J334)       Labels:| 5K0-920-xxx-25.clb
   Part No SW: 5K0 953 234     HW: 5K0 953 234 
   Component: IMMO          H20 0420  
   Serial number: 00000000000000
   Coding: 000000
   Shop #: WSC 00000 000 00000
   ASAM Dataset: EV_Immo_UDS_VDD_RM09 A03008
   ROD: EV_Immo_UDS_VDD_RM09.rod
   VCID: EA98BB300DF73F1AE8-80BE

No fault code found.

-------------------------------------------------------------------------------
Address 2E: Media Player 3 (J650)       Labels:. 5N0-035-342.lbl
   Part No SW: 5N0 035 342 C    HW: 5N0 035 342 C
   Component: SG EXT.PLAYER H13 0111  
   Revision: A1001003    Serial number: 7668721145    
   Coding: 020000
   Shop #: WSC 00066 000 00000
   VCID: A71E8204D665C27237-80F2

No fault code found.

-------------------------------------------------------------------------------
Address 37: Navigation (J794)       Labels:| 3C0-035-270.clb
   Part No SW: 3C0 035 270 B    HW: 3C0 035 270 
   Component: RNS310        H18 0357  
   Revision: 10000000    Serial number: VWZ1Z2K6328197
   Coding: 040004010400000000000000
   Shop #: WSC 01383 790 50316
   ASAM Dataset: VW_RNS310 A02005
   ROD: EV_VWRNS310UDS.rod
   VCID: 997AB4FC98116482B1-80CC

No fault code found.

-------------------------------------------------------------------------------
Address 42: Door Elect, Driver (J386)       Labels:| 3C0-959-70X-GEN4.clb
   Part No SW: 3C0 959 701 C    HW: 3C0 959 793 A
   Component: TUER-SG FT    002 0307  
   Revision: 12101005    Serial number: 0001703062
   Coding: 0010B6
   Shop #: WSC 01383 790 50316
   ASAM Dataset: EV_DCU42BroseDriveSide A03004
   ROD: EV_DCU42BroseDriveSide_VW36.rod
   VCID: A81C8138D37BCD0A3E-80FC

   Slave Driver: 
   Subsystem 1 - Part No SW: 1K0 959 703 AG    HW: 1K0 959 795 R  Labels: 1K0-959-70X-GEN4.CLB
   Component: J388__TSG-HL  006 1401 
   Serial number: 00000005397568      
   Coding: 000090

No fault code found.

-------------------------------------------------------------------------------
Address 44: Steering Assist        Labels: 1K0-909-14x-GEN3.clb
   Part No: 1K0 909 144 J
   Component: EPS_ZFLS Kl. 70     3001  
   Revision: 00H17000    
   Shop #: WSC 02069 000 90108
   VCID: B12A6C5C28A18CC2E9-80E4

No fault code found.

-------------------------------------------------------------------------------
Address 52: Door Elect, Pass. (J387)       Labels:| 3C0-959-70X-GEN4.clb
   Part No SW: 3C0 959 702 C    HW: 3C0 959 792 A
   Component: TUER-SG BT    002 0307  
   Revision: 14101005    Serial number: 0001712156
   Coding: 0011B6
   Shop #: WSC 01383 790 50316
   ASAM Dataset: EV_DCU52BrosePasseSide A03004
   ROD: EV_DCU52BrosePasseSide_VW36.rod
   VCID: A91A843CC871F40221-80FC

   Slave Passenger: 
   Subsystem 1 - Part No SW: 1K0 959 704 AG    HW: 1K0 959 794 R  Labels: 1K0-959-70X-GEN4.CLB
   Component: J389__TSG-HR  006 1401 
   Serial number: 00000005373095      
   Coding: 000090

No fault code found.

-------------------------------------------------------------------------------
Address 77: Telephone (J412)       Labels:| 7P6-035-730.clb
   Part No SW: 7P6 035 730 B    HW: 7P6 035 730 B
   Component: TELEFON       H05 0440  
   Revision: 1B001001    Serial number: 00007668680859
   Coding: 0A01000000010101
   Shop #: WSC 01383 790 50316
   ASAM Dataset: UHVNA A01007
   ROD: UHVNA.rod
   VCID: B12A6C5CE0A18CC2E9-80E4

No fault code found.

End----------(Elapsed Time: 01:14, VBatt start/end: 14.1V/14.0V)-----------
 
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   #2  

Yourgis

Verified VCDS User
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Location
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VCDS Serial number
C?ID=504990
In my country there is a saying: prepare the horse sleigh in the summer, and the carriage in the winter. So I still haven't found an answer yet and have been driving throughout all the winter without it. Is there any way to find out which condition that bite indicates? Any thoughts are welcome :)
 
   #3  

Yourgis

Verified VCDS User
Verified
Joined
Nov 19, 2018
Messages
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Reaction score
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Location
Lithuania
VCDS Serial number
C?ID=504990
UPDATE. I finally managed to solve it - I've just downgraded ECU software version from 9015 to 6779 and Z35 heater is working fine now. :thumbs:
 
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