Can s90 seats be fitted to S60

[IMAY2023]

Which PINs are you asking about? 
On the controller itself or on the Seat harness to Car's body connector? 

If you are asking about the Seat to Car harness connector.
Driver side connector:  94/505 
Passenger Side connector: 94/506
94/505:16 and 94/506:15>  15/50 CENTRAL JUNCTION BOX connector A30 (fuse number 40, 5amp)
94/506:11 From 7/255 SEAT BELT REMINDER MAT (power) > 4/176 SUPPLEMENTARY RESTRAINT SYSTEM SRS on F6.  (passenger side only) 
94/506:31 From 4/240 OCCUPANT WEIGHT SENSOR OWS  (LIN) > 4/176 SUPPLEMENTARY RESTRAINT SYSTEM SRS on F92.   (passenger side only) 

It looks like your new seats have occupant sensor and seat belt reminder but your old seats do not have. You can ignore them and just do not enable those from Orbit.  
But it just does not make sense. you are missing the main PINs, (CAN BUS, Power, Ground and some other stuff) even from the new seat's connector. 
Have a look the diagram. https://forums.spaycetech.com/attachment.php?aid=334 and search for  94/505:XX  94/506:XX  where XX is the PIN number on the connector.

[Helpful]

While I'm waiting for that mountain of spare parts that still need to be installed on my new seats (to make everything simple), I found another question. And these are the rear headrests. Now in my car the rear headrests fold with a physical button on the back of the seat. But in the new seat the headrests are already electric (the ones that fold with a button in the system menu). Perhaps this has already been discussed on the forum, if so, please give a link. Or how to solve this issue to integrate a new seat with an electric headrest?

[IMAY2023]

On the rear seats, you should have connector. PIN 5 is the ground and the PIN2 is the folding headrests. 
PIN2 on the LEFT goes to the CEM PIN FL75
PIN2 on the RIGHT goes to the CEM PIN FL76 
Then, you will need to set the 187  HEADRESTS 2nd ROW, FOLDING to 02. Which will give you the virtual button on the car functions page.

[Helpful]

On the rear seats, you should have connector. PIN 5 is the ground and the PIN2 is the folding headrests. 
PIN2 on the LEFT goes to the CEM PIN FL75
PIN2 on the RIGHT goes to the CEM PIN FL76 
Then, you will need to set the 187  HEADRESTS 2nd ROW, FOLDING to 02. Which will give you the virtual button on the car functions page.

@IMAY2023 If it's not too much trouble and you have a minute, could you describe to me what I need to add for the rear seats and how to lay the wire.

I have seats without heating and with mechanical headrests. New seats with heating and electronic folding headrests.

I have read your 4th message many times and I still can't figure it out.

For heating. Is it necessary to lay some kind of wire from the central tunnel (where the heating buttons are) along the cushion and back of the rear seat?

Along the headrests. Did I understand correctly that CEM PIN FL75 and CEM PIN FL76, it is necessary to lay the wire from PIN2 on the connectors of the backrest to the CEM itself, which is on the front panel? Is it possible to somehow replace this and install a beautiful mechanical button on the back of the seat (in my opinion, this is even more convenient than the electronic button on the "TV")?

[IMAY2023]

@IMAY2023 If it's not too much trouble and you have a minute, could you describe to me what I need to add for the rear seats and how to lay the wire.

I have seats without heating and with mechanical headrests. New seats with heating and electronic folding headrests.

I have read your 4th message many times and I still can't figure it out.

For heating. Is it necessary to lay some kind of wire from the central tunnel (where the heating buttons are) along the cushion and back of the rear seat?

First things first. 
The rear heated seats are controlled by 2 LIN slave modules (left and right) and they are on the same LIN as the front seat heater modules (left and right).  
Each module receives Power from the rear fuse box and negative from the body goes the backrest heater pad (If I recall correctly).  Check the wiring diagram. https://forums.spaycetech.com/attachment.php?aid=335  Don't worry about the S/V90 series, it's the same for all models and year when it comes to seat climate. 

You did not mentioned if you already have 4 zone climate or just 2 zone. If you have just 2 zone. You need to buy rear seat heat buttons and connect it to the existing free connector but it does not have power and LIN on the other side. (where senter console connects to the car's main wiring. (passenger side behind the cover).  The button shares the LIN with the drive mode switch and the power, I took it from the lighter connector.  If you have 4 zone, you just need to change the digital panel with the rear heated seat version. 

Along the headrests. Did I understand correctly that CEM PIN FL75 and CEM PIN FL76, it is necessary to lay the wire from PIN2 on the connectors of the backrest to the CEM itself, which is on the front panel? Is it possible to somehow replace this and install a beautiful mechanical button on the back of the seat (in my opinion, this is even more convenient than the electronic button on the "TV")?

You can try, all you need negative and positive connected to the backrest connector PIN2 is power and PIN5 is negative.

[Helpful]

Hello everyone! The seats are installed. But not all options are working yet. I'm waiting for a crimper to crimp the contacts for pin 15. And I didn't bother myself and didn't make the rear seat heating.

But I have a big question. I converted the European passenger seat and switched the passenger presence sensor from European to US, to a gel cushion. But now I have a message that the passenger is always present in the seat. I've already checked and it seems that the leather seat cushion cover (32357793) and the seat cushion foam (31498851) all match the American market. I've already completely disconnected the leather cover to relieve pressure on the sensor, but it didn't help. Only when you lift the seat cushion a little does the message about the passenger presence disappear, so the sensor is working.

How can I calibrate the occupant weight sensor (OWS)? Is such a calibration operation even possible?

[Helpful]

I implemented it! The seats from the English work on a car from the USA. But for now I will only do the front seats. I installed the rear seats but did not connect the heating and folding headrests. I got a little confused and do not understand how to do it correctly.

Now I have everything on the seats that can be  

All that remains is to figure out what to do with the weight sensor.

But during the installation I noticed something that is not very good, that double for fuse 40 that we install, but it is not working correctly, "+" comes to the contact through which 1 fuse works constantly and through the first fuse voltage goes to the second. The double must be turned over but unfortunately this is not possible, there is no space. Therefore, take this fact into account and have spare fuses for 5 amperes!

[IMAY2023]

You can use something like this, just cut the return and connect it to the wire that goes to module. Don't worry about cutting the wrong one. Just connect the fuse socket other way around.

[Helpful]

You can use something like this, just cut the return and connect it to the wire that goes to module. Don't worry about cutting the wrong one. Just connect the fuse socket other way around.

I almost didn't understand. Why cut or what exactly to cut? It's an extension cord and really thanks to it you can put the fuse double as it should! Thank you!