heated seat polo 6r retrofit problem

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Luigid
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Re: heated seat polo 6r retrofit problem

Post by Luigid »

ciclo wrote: Sat Sep 12, 2020 4:52 am Luigid, you don't need to re-explain what you've already explained previously. (at least for me)
From the beginning of this thread I verified everything related to the control units of your heated seats through the ETKA.
The 34D unit is for the 6R PQ25 for the Chinese market from 04/14/2014 (MM / DD / YY) to 2019, the 6R PQ25 for the Chinese market prior to the date indicated used the 6R0 ... A control unit .

Image

The 6R0 ... D unit is for the 6C PQ26 which is a different platform from the 6R PQ25 platform. Forget this unit, it is as if it does not exist.

The last unit you bought 6R0 ... A, has software and 'Hardware' that may not be correct for the rest of the parts that you are installing or have installed (BCM).
In the PQ25 there is a great lack of information in this regard. 'The connection LIN' does not provide the reading from the control unit for heated seats, it is a simple wire that, depending on the vehicle conditions, tells the HSeats control unit if it should be active or not.

Knowing the resistance value of the heating elements will change absolutely nothing. It is an absolute value that must not / cannot be modified under any circumstances.
However, knowing if the circuit is cut at some point is essential. If you say that the entire electrical circuit is correct, then perfect.👌

From the beginning I have thought that it is an electronic failure and not an electrical one. That's why I told you to post the purchase link.
... by the way, that the unit D that you have and any control unit A have the same numbering of HW and SW does not mean that it is the same SW.

It may be that the BCM or the control unit for heated seats do not have the appropriate SW.



---
Not related to you:
Everything I just said is based on the information you have provided. If later a miracle appears that contradicts what I have just said, it is because there is a new piece of information that I do not know at this time. This has already happened several times in the forum because someone tried to hide their own mistakes. :lol:
all clear! do not say anything to mask errors at least for me it would not help me to solve the problem (I know it was in general), I'm in Italy let me know how much you can sell it so I'm sure you have a working unit!
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ciclo
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Re: heated seat polo 6r retrofit problem

Post by ciclo »

All you have to do is tell me by private message the Address where you want to receive the control unit for heated seats. No payment is necessary, it will be a gift.
If you want, once you receive the unit tell us here the results of your tests with this unit.

I will try to send it as soon as possible, during the next week, I have to make another shipment and I will take the opportunity to make both shipments at the same time.
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ciclo
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Re: heated seat polo 6r retrofit problem

Post by ciclo »

Your control unit has been shipped today.

Image
Please inform us when you receive it.
Luigid
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Re: heated seat polo 6r retrofit problem

Post by Luigid »

ciclo wrote: Tue Sep 15, 2020 2:42 pm Your control unit has been shipped today.

Image
Please inform us when you receive it.
thanks for sure!
Luigid
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Re: heated seat polo 6r retrofit problem

Post by Luigid »

hello ciclo,the control unit arrived last Friday, unfortunately I had little time but I thank you for your availability.
I also test this unit and ... nothing !, I think I am really missing something.
I try to make a complete picture of the situation.
I start from the wiring diagram maybe I did something wrong:
Image
---------------------------
control unit to key passeger seat:
1->5
3->6
12->2
lighting->4
12v(fusebox)->3
GND->1
---------------------------
control unit to key driver seat:
4->1
2->2
6->5
lighting->3
12v(fusebox)->4
GND->6
--------------------------
control unit remaining cables
15-> driver seat resistance heat
13 + 14 -> 12V Fusebox
5-> T73A number 36
9-> GND
16-> passeger seat resistance heat
-------------------------------------------
other possible causes:
-Seat resistance too low, the control unit reads it as a short and immediately cuts the power
-problem in my bcm that does not communicate correctly with the seat control unit
-buttons not compatible with this control unit (mine 6R0963563 - 6R0963564)
other ideas do not come to me :|
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iichel
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Re: heated seat polo 6r retrofit problem

Post by iichel »

Take out the plug of the control unit, measure the power and GND.
If the resistance of the mats in the seats is not OK, you will see the buttons light up shortly.
The BCM does not matter, it will only shut off the heating (but not the lights in the buttons) if the engine is not running.
Luigid
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Re: heated seat polo 6r retrofit problem

Post by Luigid »

iichel wrote: Thu Sep 24, 2020 7:41 am Take out the plug of the control unit, measure the power and GND.
If the resistance of the mats in the seats is not OK, you will see the buttons light up shortly.
The BCM does not matter, it will only shut off the heating (but not the lights in the buttons) if the engine is not running.
voltage ok, about 13.8-14v with engine running.
resistors ok, about 7-8 ohms .
when I press button the voltage is eroghed but immediately cut off.
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ciclo
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Re: heated seat polo 6r retrofit problem

Post by ciclo »

Luigid wrote: Thu Sep 24, 2020 7:34 am hello ciclo,the control unit arrived last Friday, unfortunately I had little time but I thank you for your availability.
I also test this unit and ... nothing !, I think I am really missing something.
I try to make a complete picture of the situation.
I start from the wiring diagram maybe I did something wrong:
Image
---------------------------
control unit to key passeger seat:
1->5
3->6
12->2
lighting->4
12v(fusebox)->3
GND->1
---------------------------
control unit to key driver seat:
4->1
2->2
6->5
lighting->3
12v(fusebox)->4
GND->6
--------------------------
control unit remaining cables
15-> driver seat resistance heat
13 + 14 -> 12V Fusebox
5-> T73A number 36
9-> GND
16-> passeger seat resistance heat
-------------------------------------------
other possible causes:
-Seat resistance too low, the control unit reads it as a short and immediately cuts the power
-problem in my bcm that does not communicate correctly with the seat control unit
-buttons not compatible with this control unit (mine 6R0963563 - 6R0963564)
other ideas do not come to me :|
-The diagram is correct.
-Your BCM 6R0937087D is fully compatible with heated seats.
-The buttons are compatible with the unit I have sent you (ETKA). They were later revised, but the control unit remains the same.
-The value/data of the resistance does not appear anywhere, so it is not possible to know if the ohms you mention are correct.

You have commented that you made a slight modification in the wiring of the heating elements, check the work you did, the contact terminals must be well locked in their connectors.
They can pop out of the connector when plugged in. :|
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ciclo
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Re: heated seat polo 6r retrofit problem

Post by ciclo »

Image

Image
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til3tsio
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Re: heated seat polo 6r retrofit problem

Post by til3tsio »

Hi,

I am retrofitting heated seats on my pq25 Toledo, and I have an issue.
When I press the button both LEDs turn on, when I press it for a second time only one stays on and if I press it again they turn off. But in any case, after a few seconds or even instantly sometimes button LEDs are switched off automatically. Button illumination works properly.
Measuring voltage on output for seats stays at 0 V , heating pads measure 4 Ohm each and are connected in parallel as Elsa indicates for my car.
All testing is performed with engine running because module is connected on +75x power.
BCM is 7E0937090B, byte 15 bit 4 is 1, adaptations channel 63 is set to 20
coding is 7A980B8000FB1600B3080E306ECB16D80F80600F608E23D0020400034820

I have original relay 6R0959772A and original Toledo buttons.
wiring and pads bought from Ali and they are for Polo 6R, pads have part number 34D 953 ...
I repined the wiring on buttons according to Elsa because Toledo and polo have different pinout there.

Any suggestions on why seats does not work ?
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iichel
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Re: heated seat polo 6r retrofit problem

Post by iichel »

This suggests that the control module is not compatible with the heating pads, or a problem with the pads or wiring
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til3tsio
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Re: heated seat polo 6r retrofit problem

Post by til3tsio »

I have checked everything again, I found a loose ground on driver's seat and now this side works as expected.
I also checked all the combinations of heating elements on the driver side and every single one of them is working without problems.

But still no output on the passenger side , wiring tested ok though.

Without the heating elements connected and without activating the switch as soon as I start the engine I am measuring 13 volts on the driver side. When I connect the heating elements voltage drops to 0 V.
That is not happening on the passenger side, there voltage is always 0 V.

Maybe something is wrong with the module.
Now a new question arises, should I buy a 6r0 module or a 34d ?
Last edited by til3tsio on Mon Mar 13, 2023 9:59 pm, edited 1 time in total.
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iichel
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Re: heated seat polo 6r retrofit problem

Post by iichel »

I'd recommend 6R0 as a module
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