Looking for data for PTC auxiliary heaters from the VW Phaeton.

Hello.

"Since I don't want to be cold anymore in the winter, I got two very cheap PTC heating elements from a VW Phaeton. However, I'm now having problems connecting them. They have 3 terminals: 2 very thick ones, and one thin one." I'm assuming there are probably two possible ways it's connected.

Variant 1: There is always voltage applied to the two thick contacts. When tension is applied to the thin wires, it works.

Option 2: If voltage is applied to the two thicker contacts, the device will work. The thinner wire is the diagnostic lead. The same applies to the Golf V; the data is also readable.

I also don't know what "plus" and "minus" refer to in this context. It would also be great if someone could provide the part number for the large connector. There's quite a bit of technology inside.

Part number: 3D0 959 984.

Manufacturer: DENSO

It would be great if someone could provide me with this information. Here are some more pictures:

PTC element:
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Connections:
[img][/img]

Platinum.
[img][/img]http://www.pictureupload.de/originals/59546/061009123607_sonstige_zuheizer.jpg{MARKER}http://www.pictureupload.de/originals/59546/061009123708_sonstige_zuheizer_stecker.jpg{MARKER}http://www.pictureupload.de/originals/59546/061009123803_sonstige_zuheizer_platine.jpg{MARKER}

Without looking at the schematics, I strongly suspect that the two thicker wires are connected to a constant positive voltage.

The skinny guy is at the controls.

Based on the two ICs and the single power driver, I strongly suspect that this is not a simple on/off control or a pure PWM control, but rather a single-wire bus, likely LIN.

If I were you, I would take a look at the wiring diagram to see how it's depicted there, but I highly doubt you'll be able to replicate it.

It should be significantly easier to remove the control electronics and individually control the three pins of the heating element. However, it is essential to ensure that the control and wiring can handle the necessary current load. Furthermore, it is essential to include an over-temperature shut-off .
(Otherwise, the fan might fail, or the PTC control relay could get stuck, and your car will just be a burnt-out wreck.)

Regards,
Guste.

The part number for the larger connector is 4B0971959, and for the smaller connector, it's 1J0972923.


As you correctly suspected, the thicker wires go to +30 and ground respectively, while the thinner wire serves as a diagnostic and control line to the Climatronic control unit. Please refer to the attached diagram for details.


Given the way it's wired, I suspect that the resistor shown in the diagram simply limits the current once the device gets too hot. Just try it out and connect the two thick wires to the 12V inputs...

Before you start, find the plug that has "-1-" and "-2-" marked on it. This will tell you which pin is positive and which is ground, as indicated in the SLP diagram below.

Thank you both very much. That helps me a lot already. I'll go get some plugs first, and then we'll see.

Purely out of curiosity, is this a T4 project or a Golf project?

"Because, actually, the water heater, which your Golf also has, isn't that bad. In my car, it takes only 2 minutes to get warm air."

The T4 doesn't have a water heater. Golf is not played in the winter, and I'm not interested in it.

The simplest solution: a parking heater! You don't have to freeze while scraping ice! The T4 often has factory-installed heaters.

Yes, but he usually only had those features in the Caravelle or Multivan versions... Fortunately, our ACV has a diesel auxiliary heater and a standing heater...

T3Surfer wrote:

The T4 often has factory-installed auxiliary heaters

.
Okay, that's correct if it has a heat exchanger in the back. However, trucks usually don't have a bed in the back. Why only???

Ibiza1986 wrote:

The way it's wired, I suspect that the resistor shown in the diagram simply limits the current once the device gets too hot. Just try it out and connect the two thick input terminals to 12V...

Don't pay too much attention to the symbols in the wiring diagram. They are usually meant to be symbolic.

Have you checked the SLP (System Logic Processor) to see where the supply voltage is coming from?

I strongly suspect that the PTC heater is directly connected to the positive terminal (via a fuse, but not through a relay). Therefore, it probably won't help to add juice to it.


@PTC owners:
Could you take a look and see if you can read the IC markings? If they aren't custom ICs (like Bosch ICs), then we can at least decipher the general function of the circuit based on the datasheet. This then also determines how it is controlled.

However, it's also possible that in the end, we only find out that it's originally controlled, for example, via LIN. However, that won't really help you, as you won't be trying to replicate the original LIN control system.

Therefore, I stand by the statement above.

guste100 wrote:

It should be considerably easier to remove the control electronics and to individually control the three pins of the heating element. However, it is essential to pay attention to the necessary current carrying capacity of the control and wiring. Furthermore, it is essential to include an over-temperature shut-off feature. (Otherwise, the fan might fail, or the PTC control relay might get stuck, and your vehicle will just be a burnt-out wreck.)

Yes, that's right, it goes directly to terminal 15...

guste100 wrote:

@PTC owners: Could you take a look and see if you can read the IC markings? If they aren't custom ICs (like Bosch ICs), then we can at least decipher the general function of the circuit based on the datasheet. This then also results in the control mechanism.

I just checked, but unfortunately, I couldn't find anything.

You should have gotten some of the older A6 models instead; those don't have any electronics. Just in case you get stuck here.

christians wrote:

You should have gotten some from older A6 models; those don't have any electronics...

. . . or from a Polo 9N / Ibiza 6L / probably also a Fabia.

...or freeze like a man ...

matthiasTDI96 wrote:

...or freeze like a man ...

It's not really the freezing itself that bothers me so much; it's more the iced-up windshield.