Seat problem

[tomichik]

On the seats!
Volvo v60 2021, there were regular seats in the base, mechanical + electric lift and electric lumbar cushion!
Bought R design seats fully electric + retractable leg support and side supports!
Installed, ran the wiring to can H and Can L, as a result, the passenger one worked immediately, even without connecting to Orbit
The driver's does not work!
Connected orbit, carried out all the procedures, turned everything on, the result: the passenger one works everything except the side support!
The driver's does not work, but when you press the button, the relay clicks in the area of the buttons!
The most interesting thing is that the passenger seat, if you pull the additional functions lever, it says that the driver's seat is adjusted! If you pull the same lever on the driver's seat, then the inscription "passenger seat adjustment" appears, but they are not adjusted in any way!
I thought that the seats were taken from an English right-hand drive car (although according to the wiring, pin 31 was on the passenger seat, as it should have been with the left-hand drive! I thought about it and decided to swap the seat control units! I did it! The effect is the same! The driver's does not work and only calling the additional button writes on the screen "adjustment of the passenger seat"
The passenger works completely except for the lateral support and says that it is the driver's!
Maybe someone has encountered this?

Yes, found the reason for Your passenger seat problem. Passenger seat wiring harness has one extra wire, from A21 of PSM to ground. This must be there only in the passenger seat. Otherwise, car does not know which seat is the passenger, which is the driver seat. 

On the seats the buttons should still work despite that above, so You have also other problems on Your driver's seat - check carefully all the wirings, compare to the wiring diagram.  The connectors can be missing the pins, so check carefully with a multimeter that You'll get all the needed signals/power from the main connector. 

I also installed right-hand drive seats to left-hand drive car, and needed to:

1. Rewire that A21 ground signalling on the PSMs
   
2. Change the seat belt reminder mat to passenger side, and rewire that to the main connector. 
   

where exactly should pin 21 be connected to the seat body? in picture 1 or in picture 2? I don't have pin 21 either on the block or on the cable, or on the right or left seat! I know that I have seats from a 2017 xc90, maybe it was different before?