Finally I have almost finally done the job of the retrofit (need to do doorpanels still).. Didn't have the time for it else would done it earlier. I would like to make this topic for others a point of information.
What I was missing and caused confusion on the installation, is that the seat control module was missing (duh.. I looked totally over it, didn't notice it was missing because my original seats were just comfortline..).
So what is done and bought (Golf mk75 2017):
Bought Ergoactive seat without airbags half leather (and without driver seat control module..) for around € 500 (with shipping).
Bought High BCM module. (5Q0937084CG) for around € 150 (with shipping + warranty, on ebay you can find it cheaper).
Climate control. (5G0907044 CF) (around € 75 euros incl shipping).
Seat control module. (3AA959257) (around € 50 euros).
Kufatec wiring seat heating + adjusment (39952-1) (around € 70 euros).
(+/- pricing added, so you can make a costs projection).
The interior set:
Original interior:
I had already the High can gateway module etc.
As it was for me the first time on installing this kind of stuff and wiring it was a very fun (sometimes.. I admit) and learnable job to do. I will add some pictures later on for future people that are retrofitting this to. With also the adaption / coding stuff.
First swapped the airbags and belts of the seats. I did first the back seats as they were the easiest (driver seat was done last). *Note that you need to open the plastic cap of the big back seat to place the belt. You can open the big black rounded rectangle plastic rim (tip for the starters).
After the back seating was done, I started with the passenger seat. First I uninstalled the four bolts with a XZN bit (Bit 2597-02 ∙ Sechskant8 (5/16 Zoll) ∙ Innen Vielzahn Profil XZN - 2597-02 von Hazet). You can do this easy, with first slide the seat to the back, unscrew the two front bolts. And vice versa, slide seat to front and unscrew the back bolts.
Then becames the fun parts, swapping airbags. You need to uncut some clips that are keeping the leather/stoff to the seat foam. Then you can pull up the seat cover. Unscrew the bolt that is keeping the airbag in place. I have also uninstalled the wiring on the original comfort seat. The same proces is done backwards at the ergo active seats. I you have no tool for the tinner/iron clamps/clips inside the back you can use strong tiwraps to. You will not notice them if you take place in the seats.
You will have an extra wire for the seat heating @ the ‘new’ seat. This big one, is ofcourse for the heating mat inside the seat. The other two cables and gong sensor were swapped, so they could be connected easily again.
Then I did the arm rest. Since this on is leather to. It was done pretty easy. You can remove the top cover. It is pretty straight forward. I did only replace the cover, since I don’t going to install startstop stuff etc. I also don’t need the two extra buttons for disabling asr or switching driver profile, since this can be done by the 5f and it is needing some wiring to (and I hate that stuff).
After the backseat and passenger front seat was done. I installed the climate control panel. It was easy and didn’t need to remove the component protection of it. It was working straight away. You only need to enable the seat heating bit in vcds.
I installed in meantime dynamic tail lights and xenon headlights to the car. So project was a bit on hold.
Then the bcm arrives.. Damn, the original one… That was ridicoulus hard to remove from the left side / below the dash @ steering side when doing that for the first time. I did the wiring on a later time, because I drive the car everyday. So first installed the BCM.
Buh.. Christmas time.. The car was having the wrong adaptions, coding, component protection etc. So you will need odis / online access for this one. If you don’t have odis / vas by yourself, swap the bcm @ the dealer and let them remove the CP, set the module to upgrade state and code/adapt it to the standard known online procedure (previous vcds tweaks are lost then, so write them down).
After that was sorted and everything working again I started to replace the driver seat. Almost the same procedure as the front passenger seat. Only I didn’t know that it needed a seat control module (f***). So the seats and bcm were installed and also the armrest cover. Finally I had some time (and courage) to do these wiring stuff, when you are doing it.. better buy some footwell lights (aliexpress) if you dont have them. You can install it easily in front (+ back, I didn’t install it at the bottom front seats at the moment) to. The wiring of the footwell goes to C72. Back to the seat harness. I installed and I must say. That kufatec wiring is good stuff. You can easily install it below the floor. It are very long wires, so you shouldn’t have any problem with that. Added it to the bcm pins as instructions of kufatec. Added fuse on 45. And tested the seats.. That ergo massage function is nice!
I opened vcds, did go to control module 09 and activated seat heating (am bcm).. Not working.. Grr. I checked everything, wiring oke, climate control module working, button glows up etc.. My german is not that good so it did take some time that I needed to set the temperature in the adaptions (!!). 1-2-3 is the drivers seat. 4-5-6 is the passenger seat. Default values, make 3 and 6 a temperature 53.5 celcius (that’s hot..). I made them under 45, above 46. So if I am correct I have now ( 1 and 4) 25-26. (2 and 5) 34-35. (3 and 6) 45-46.
Tested it, and finally working! Now I only still need to do the doors, and replacing the standard mirrors to electrical folding mirrors (also adding the door lights). I hope to do these in the next weeks. Also I will add some pictures maybe later to this post. On the progress and ho wit looks now. All by all, good lessons and I think I did a pretty good job for a first time and only calling the dealers for the latest BCM info (lol)..
How it looks now (still have to do the doors as mentioned), also added RVS pedals.