Volvo V/S90 front seats retrofit.

Oleelstad · Post by **Oleelstad** » 13 Nov 2023, 07:26

Hello.

I have scoured through the forums and found a post about S60 seats but they are quite different from what I have recently purchased.

I have gotten my hands on two front seats from a 2017 S90 that I would like to retrofit into my Nissan Patrol. The seats looks very nice and are in good condition but I am struggling in trying to figure out how the wiring of these seats are done. Also as far as I am aware there is no airbags in these seats correct? I can not find any markings on either of the seats.

I have added some photos of the different wires and plugs etc. The drivers seat does have a seat control module but the passenger seat does not. I would figure the passenger seat would be easier to retrofit.

Does anyone have any idea how to attack this or have any wiring diagrams?

Oleelstad · Post by **Oleelstad** » 04 Sep 2024, 06:32

Anyone?

Been thinking of switching the electronics for rocker switches.

I do think that if I knew what canbus signals the seats requires I would be able to get them to work as is.

Liqwood · Post by **Liqwood** » 14 Sep 2024, 21:19

Any luck with this? So just power and ground didn't allow them to operate at all?

Did you try just the passenger seat?

Did you try any of the fixes people use for the BMW seats?

I have a passenger XC40 I want to retrofit but don't want to buy without having a clue what I'm getting into here.

Norimondo · Post by **Norimondo** » 21 Mar 2025, 16:38

Did you ever figure out an answer? I'm looking to mount a seat from an S90 into a simrig

diz · Post by **diz** » 29 Jun 2025, 08:44

I have a similar seat I'm trying to get working for my simrig. Mine is supposedly an XC40 seat from ~2019.

I've been trying to figure out the wiring, here's what I have so far.

When 12v power is applied to the obvious 12v wires from the seat harness, nothing moves with the switches. There are 4 Omron G8K Twin relays on the board. With no seat movement switches being activated, here's where there is power on the relays. The main power input is at the top of the picture.

Oddly, to me at least, if I apply +12v to the relay pin highlighted in yellow, the seat back moves forward. Other than that, I could find no effect of jumping power around on these relays, nor continuity or voltage changes as a result of operating the seat switches.

If anyone's into it, let me know. Otherwise I'll probably just go buy a manual bucket seat for my second sim rig.

diz · Post by **diz** » 09 Jul 2025, 12:38

Well I don't like giving up so I've been hacking away at this for about 9 days. Learned:
0. To stay away from the orange connector, so I did.
1. Nothing I could figure out with applying power alone would activate the seat switches/relays. With power connected to the seat, I looked for power, and then applied power to each all of the seat connector wires, nothing.
2. Canbus spoofing might have done something. I was passing a 1khz signal from an arduino into the green (+) and brown (-) wires from the seat harness. That didn't enable the seat switches or make any relays audibly click, so I started looking for an additional power trigger wire.
3. The side airbag is on the orange wire, and applying power to it while all of the rest is hooked up makes that airbag deploy beautifully.

I have to disconnect everything to get a good look at it, but I assume it's trashed now so I'm going to end up tossing it. But part of me wants to keep going now that I got it to do something, if nothing else, for the next poor bastard going down this path. Do any of these seats have more than one airbag?

Oh yeah, I also tried a one month subscription to eautorepair.net for the wiring diagrams, but found out (confirmed by them) that they don't have any wiring diagrams for this model.

diz · Post by **diz** » 09 Jul 2025, 12:42

For your entertainment.

Oleelstad · Post by **Oleelstad** » 07 Aug 2025, 04:50

diz wrote: ↑09 Jul 2025, 12:42 For your entertainment.

Haha, I disconnected my airbag since I knew they were there. I can't remember what wires they were. But I would assume Orange and brown "twisted" pair.

If that is the case then my testing today was a waste, I also tried to connect +12V, GND and canbus high/low.

But the twisted pair is the only "option" I could think of for canbus, anyone else have any suggestion?

Oleelstad · Post by **Oleelstad** » 07 Aug 2025, 12:09

diz wrote: ↑09 Jul 2025, 12:38 Well I don't like giving up so I've been hacking away at this for about 9 days. Learned:
0. To stay away from the orange connector, so I did.
1. Nothing I could figure out with applying power alone would activate the seat switches/relays. With power connected to the seat, I looked for power, and then applied power to each all of the seat connector wires, nothing.
2. Canbus spoofing might have done something. I was passing a 1khz signal from an arduino into the green (+) and brown (-) wires from the seat harness. That didn't enable the seat switches or make any relays audibly click, so I started looking for an additional power trigger wire.
3. The side airbag is on the orange wire, and applying power to it while all of the rest is hooked up makes that airbag deploy beautifully.

I have to disconnect everything to get a good look at it, but I assume it's trashed now so I'm going to end up tossing it. But part of me wants to keep going now that I got it to do something, if nothing else, for the next poor bastard going down this path. Do any of these seats have more than one airbag?

Oh yeah, I also tried a one month subscription to eautorepair.net for the wiring diagrams, but found out (confirmed by them) that they don't have any wiring diagrams for this model.

The wiring diagrams is almost impossible to find sadly. They are keeping everything from 2017+ very close to heart. I managed to get some but the quality is very bad.