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  1. #1
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    Question Webasto Thermo TOP V. 2004 Touran 1.9 TDI. PD. ENGINE CODE, AVQ

    HI ALL, can anyone tell me where my Webasto, Thermo,Top, V gets its start signal from, I bought the car in 2008, I got no remote for the heater, no timer, in fact when i went back to the dealer,he said he had never seen one these heaters, I have removed the heater unit to try and diagnose why it is not starting,I checked the glowplug, temp sensor, over heat sensor, air intake motor,now found( water pump) not running,have ordered new pump,this would make the unit overheat and shutdown,well i am happy found that fault,but now to the Fuel supply pump, I know that the unit sends a live feed to the the fuel pump,but i have a feeling that there must be a switched earth within the vehicle before the unit sends its live signal to the fuel pump,? does it come from the ignition switch, vehicle heater switch, relay, etc, as the Webasto is fitted by VW. they will have wired it into the Touran loom.
    Help,dieseldes.

  2. #2
    Administrator Crasher's Avatar
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    It is commanded digitally via the CAN BUS system by the heater control unit. Without fault code reading equipment that is also capable of Measuring Blocks and Output Test functions you will find it nearly impossible to work out what is wrong. You could even replace a faulty part and it still not work due to a code issue.
    2003 Skoda Octavia VRS Estate. APR 98RON remap, APR R1 diverter valve, Jetex exhaust, K&N panel filter, 8x18 Wolfrace Pro-Lite eco 2.0 wheels with 225/40 18 Uniroyal Rainsport 3 tyres.
    2006 Polo GTI 1.8T, APR 95RON remap
    1988 Golf 2 GTI 16 valve, 2.2 with Weber Alpha injection
    1983 Golf 1 GTI 8 valve, 2 litre with Eurospec racing 42/36 head
    1972 1302LS auto 1641cc conversion

    Vile Invention

    Dark was that day when Diesel conceived his grim engine that begot you, vile invention, more vicious, more criminal than the camera even, metallic monstrosity, bale and bane of our culture, chief woe of our Commonweal. How dare the Law prohibit hashish and heroin yet license your use, who inflate all weak inferior egos? Their addicts only do harm to their own lives: you poison the lungs of the innocent, your din dithers the peaceful, and on choked roads hundreds must daily die by chance-medley. Nimble technicians, surely you should hang your heads in shame. Your wit works mighty wonders, has landed men on the Moon, replaced brains by computers, and can smithy a "smart" bomb. It is a crying scandal that you cannot take the time or be bothered to build us, what sanity knows we need, an odorless and noiseless staid little electric brougham.

    W.H. Auden (1907-1973), A Curse:

  3. #3
    Administrator Keithuk's Avatar
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    Welcome to the forum.

    Can I suggest that you add your car spec to your signature as it will save users asking everytime, if you know the engine code that will also be great? Oh you can't do this of a phone. Adding your car spec.

    Options Sticker and Engine Codes
    2010 Golf GTD (170) CBBB, 5 Door, Shadow Blue (P6/D5Q), Transmission Code: KXZ, Flat Tyre Indicator, Basic Protection Pack + VCDS.


  4. #4
    Senior Member
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    Jan 2012
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    York
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    I had a problem with my webasto heater when i bought mine and yes the only way to diagnose it was to put the diagnostics on it and mine had a faulty electric water pump, replaced the pump but it still did not work as the unit was locked and had to go through basic settings to unlock it and it works fine now. I personally would not replace bits on it until you have read the fault codes. As far as i am aware the remote to operate it is an option, prob very rare to find in uk.
    2007 Touran Sport 2.0T TDI 170PS, Engine code: BMN

  5. #5
    Junior Member
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    Dec 2012
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    N, Ireland
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    Cool Webasto Heater 1.9 Touran 2004 AVQ

    HI, Tony, I had a leak in the windscreen washer pipe which is located beside the webasto Heater, I removed the heater and done a few checks, I found the water pump of the heater faulty, I fitted a new one. now waiting to have Diagnostics done, I think it got an overheat signal, which puts it in locked mode, let you know how I get on, Thanks, DES.

  6. #6
    Senior Member
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    Hi , yes mine went into locked mode due to the pump fault. It had 2 fault codes in mine, 1 for the pump faulty and the other was unit locked. I put the fault code into the ross-tech site and it gave the instructions how to unlock it through basic settings. Just make sure whoever does your diagnostics has a machine that will do basic settings on the webasto. Vcds is most ideal.
    2007 Touran Sport 2.0T TDI 170PS, Engine code: BMN

  7. #7
    Junior Member
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    Dec 2012
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    Webasto Thermo TOP V. 2004 Touran 1.9 TDI. PD. ENGINE CODE, AVQ

    Thanks Crasher, just had the faults cleared on my Touran heater, the sleet was blowing in the garage door, I said to the mechanic i probably wont know until to -night if it is working, but I had not the words out two seconds,when we both seen the smoke coming out near the drivers door, great to see it running after four years,and to see it coming on and off intermitttently as temperatures fluctuate, super,Thanks again,

  8. #8
    Junior Member
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    N, Ireland
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    Hi Tony, got the faults cleared on my Webasto Heater, one minute later she fired up, that is the first time it started in four years, Circulating pump 80.00, Diagnostics 20.00 total 100 .00 and worth every penny for instant heat, and a clear windscreen, all the best keep her between the white lines, Thanks Des.

  9. #9
    Senior Member
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    Jan 2012
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    Hi des , glad u got it working , yes its great when it works!
    2007 Touran Sport 2.0T TDI 170PS, Engine code: BMN

  10. #10
    Junior Member
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    Dec 2012
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    N, Ireland
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    HI, Tony, I would like to add that I de-coked this heater and serviced same as Webasto Manual, I would imagine that anyone doing very short journeys over the six Winter months could have health problems due to excessive toxic fumes entering the vehicle, I noticed when the Touran started up from cold,that the Webasto heater was not burning very efficiently,as the temperature rose it got slightly better, but if you only drove to the local school, and a two minute stop at the traffic lights, plus five minutes at the paper shop,and back home, Oh Man the car interior was lovely and warm, and the bonnet still had four inches of snow on top,but my tongue, and lips, were burning with diesel fumes that had entered the vehicles heater air intakes,my Wife could smell the fumes off my clothes after the two mile journey, well I know that VW. have retrofitted a longer exhaust pipe from the Webasto to the rear of the vehicle, but there must be a lot of vehicles out there that did not avail of this retrofit, Diesels are bad for our health, and the environment, THERE MUST BE A BETTER WAY AND SOON. DES.


 
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