[Matthew53]

Hello, I've got G20 2019 for retrofit electric seats without memory.

There is currently lumbar support (SA488)

I think that I would need only add 2 wires from every module seat to BDC can terminator and add power supply cables, because in lumbar seats there is power supply on pin1 X14*1B and on seat modules it goes to pin 15 X14*1B.

Is anything else would be needed here?

I've heard that some people had some faults about steering column or active headrest, but I don't think it would be applicable in my case since car has no active headrest or electric steering.
Here is the equipment:

01AG Larger fuel tank

01CB CO2 equipment
01SX 16" light-alloy wheel V-spoke 774
0230 Extra package, EU-speciifc
0255 Sports leather steering wheel
02PA Locking wheel bolt
02VB Tyre pressure display
02VC Tyre repair set
0302 Alarm system
0320 Deleted, model lettering
0430 Interior/outside mirror with auto dip
0431 Interior mirror with automatic-dip
0465 Through-loading system
0488 Lumbar support, driver and passenger
0493 Storage compartment package
04GN Interior strips quartz silver matt
0508 Park Distance Control (PDC)
0534 Automatic air conditioning
0544 Cruise control with brake function
0548 Kilometre speedo
05AQ Active guard plus
05DA Passenger airbag deactivation
05DC Rear-seat headrests, folding
06AE Teleservices
06AF Statutory emergency call
06AK Connected Drive Services
06C4 Connected Package Professional
06U3 BMW Live operating area Professional
07LC Modell Advantage
0843 Power reduction
0868 Language version, Dutch
0886 On-board literature, Dutch
08AP Dummy-SALAPA
08KB Oil service interval 24 mths / 25,000 km
08R9 Refrigerant R1234yf
08S3 Automatic locking during starting
08TF Active pedestrian protection
09AA Outer skin protection
09QX Preparation driver assistance
A070 70 Ah AGM battery