[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
(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.