[BMW-ALPINA]

I got a lot of messages for the passenger seat memory retrofit I did in my G26 i4 M50, so I decided to make a DIY. My car is a LHD manufactured 05/2023 so the retrofit is based on that. RHD vehicles need to choose the LHD-parts instead.

Memory switches:
61319867158 (RHD, seat memory, black)
61319490318 (RHD, seat memory, galvanic)
61319867157 (LHD, seat memory, black)
61319490317 (LHD, seat memory, galvanic)

Requirements for the retrofit:
The vehicle needs to have M-sport seat and/or seat ventilation. This will not work on cars with the small seat module as the regular sport seats has. The M-sport seats and/or seats with ventilation has the big codable module.

Coding:
BDC -> SCHALTER_SITZEXT_VR_LIN_VAR -> nicht_aktiv to sfz_mem
BDC -> SCHALTER_SITZEXT_VORNE_VERBAUT_BF -> nicht_verbaut to verbaut
MGU -> SEAT_MENUE_FB nicht_aktiv to aktiv
(not needed to get it working, but recommended if you want it to behavior as it was from factory)
CBFS_S15 -> MEMORY -> nicht_aktiv to aktiv
CBFS_S15 -> MEMORY_TTB -> nicht_aktiv to aktiv
CBFS_S15 -> MEMORY_POPUP_VERSTELLZEITBEGRENZUNG -> nicht_aktiv to aktiv
CBFS_S15 -> MEMORY_POPUOS -> nicht_aktiv to aktiv
CBFS_S15 -> MEMORY_GONG -> nicht_aktiv to aktiv

I often forget to take pictures along the way, so unfortunately something will only be explanatory.

1. Remove the door panel
2. Remove the inner door panel cover/the sealing to get access to the window lifter motor
3. Make your wiring harness as shown in the picture below
4. Remove the dummy piece in the speaker cover and put in the memory switch
5. Code and test
6. Rebuild!

(for european cars: I recommend to retrofit the passenger door lock switch as well when the door already is apart. NB, that retrofit requires one wires inside the car to the BDC, but that can be done later. I went for galvanic switches for the door locks as it blends with the door trim and black for the memory switch as I think it blends better into the speaker covers)

I take no responsibility for any errors or consequential errors resulting from the retrofit. This is done at your own risk. The car has to be recoded if you have done OTA or update by your dealer.

https://www.youtube.com/shorts/UKu4SwzxJxA

[AdonisP91]

Alpina it is super nice that you posted this information. Thanks.

Forgive me if I am slow to understand, but if the car's seats has the small module #61359824564 like this:

https://www.bmwpartsdeal.com/parts/b...357490465.html

What if I buy and install the big module #61355a7cb21 like this:
https://www.bmwpartsdeal.com/parts/b...355a7cb21.html

In Germany the memory is on the left, in UK memory on right, presumably the seats are the same but it is that the modules are flipped from one side to the other. So why can't I just add a second big module and continue according to your guide?

The website I listed the parts suggests that the units can be installed either side:

[BMW-ALPINA]

I understand your thinking and have considered that it could be a solution for those with small seat modules. The problem is that the wiring for the passenger seat (on the car side) is different than what it is on the driver's side. Therefore, you have to do wiring work on the car side as well to get the large seat module to fit. It should be doable, but it puts the retrofit into an "another level".

The big seat module is shown in the passenger side as the M-seats and seats with ventilation has the big seat module - and off course the RHD-cars. Which also explain why the LHD side also can use part #2.

[AdonisP91]

Originally Posted by BMW-ALPINA

I understand your thinking and have considered that it could be a solution for those with small seat modules. The problem is that the wiring for the passenger seat (on the car side) is different than what it is on the driver's side. Therefore, you have to do wiring work on the car side as well to get the large seat module to fit. It should be doable, but it puts the retrofit into an "another level".

The big seat module is shown in the passenger side as the M-seats and seats with ventilation has the big seat module - and off course the RHD-cars. Which also explain why the LHD side also can use part #2.

Ah good to know and that is what I feared that there would be much more wiring needed under the seat as well. I might try it down the road. Cheers

[BMW-ALPINA]

Please keep us posted if you goes that way! It would be nice to see if you success.

[dadaabmw]

I'm considering doing this on my i4. Before I start I want to confirm I have the correct module. Is it located under the seat?

[BMW-ALPINA]

Originally Posted by dadaabmw

I'm considering doing this on my i4. Before I start I want to confirm I have the correct module. Is it located under the seat?

Yes, it's located under the seat.

[hky]

BMW_Alpina

Passenger seat memory related.

I recently retrofitted comfort seat to my F10 535i RHD. Originally I don't have passenger memory.

On the passenger seat, now the Memory only works for the knee support and side bolster, it will not work for up or down.

Could this be a module under the seat, problem?

I cannot confirm if it works from the donor car, bought it from parts out.

Thanks

[M_Bimmer]

hky, it's hard to say at this point what might be wrong and I do not know if you have ISTA.

1. I'd exercise every button on the seat switch panel to min and max positions

2. I'd run ISTA to readout fault codes, and ensure that no seat module is "red" or bus wires are "red" (Red = hard fault)

3. Assuming all is good, I'd run seat calibration (it learns where the "stops" are at each min/max adjustment location)

One of these steps should help steer you in the right direction....

GL

[Adrien]

hi, Please note that for G20 and G80 it is different, and the pin to use is 7 for the BFT_LIN on the window lift motor

[BMW-ALPINA]

Originally Posted by Adrien

hi, Please note that for G20 and G80 it is different, and the pin to use is 7 for the BFT_LIN on the window lift motor

Good to know. Thanks for writing.

[Adrien]

And its work perfectly

I just did it on my G80

And on MGU ; SEAT_MENUE_FB nicht_aktiv to aktiv

[AdonisP91]

Adrien and @BMW-Alpina. How are you all wiring into the memory switch? Soldering or you have the part number for the connection piece / pigtail that plugs in?

[BMW-ALPINA]

Originally Posted by AdonisP91

Adrien and @BMW-Alpina. How are you all wiring into the memory switch? Soldering or you have the part number for the connection piece / pigtail that plugs in?

I did soldering as I didn't have part number for new pins for the window lifter motor.

[AdonisP91]

Originally Posted by BMW-ALPINA

I did soldering as I didn't have part number for new pins for the window lifter motor.

Right on, thanks!

[gergokoppany]

Thank you for this guide. I just completed it on my G22 M440i, and it works flawlessly.

[DDDGGG_M]

Can the requisite coding be done with BimmerCode?

[AdonisP91]

Originally Posted by DDDGGG_M

Can the requisite coding be done with BimmerCode?

Yes

[BOY69]

Not as easy to mount the switch on the G20/21, but still possible.

Required:
- 51417945706: black trim for right side door
- 61317937970: switch for right side door

The wiring is done the same way as described in this thread. For the window lifter motor connector I used a 61131393724 pin to rewire.

[larrylam646]

I finally got around to retrofitting seat memory functionality into my vehicle's front passenger seat (equipped with the small module).

Referencing earlier posts, I purchased a used driver's seat SM2 module + associated wiring harness from an X4 G02 believing that all I had to do was swap the module+harness and code.... was I wrong.

To make a long story short... all is working properly but I also had to swap out all of the seat motors for ones with Hall sensors and the switch control panel + related seat trim; modify the X4 harness; and FDL code several ECUs.

I opted to use the 3rd-party gentleman switch per soi3847 post (https://g20.bimmerpost.com/forums/sh...57&postcount=1) but in order to debug the FDL coding to get this switch to work, I confirmed the passenger seat memory functionality worked properly by following OP instructions.

Was the cost+time worth it... probably not.... What I thought would be a U$150 project turned out to be ~U$650, for mostly used parts.