[Zamora0214]

It's pretty straight forward to remove the middle seats. There are four hex blots on the floor around corners. Once you remove them, unplug the green connector shown in this picture, and the seat is ready to be moved.

If you leave the connector unplugged, there will be SRS airbag error on the console every time we start the car. We need to "hack" the sensors. It appears that our XC90 sensors are pretty smart, so completing the circuits won't fool the system. I figured that the sensors expect a particular resistance value from the connector. So we need a 3ohm resistor for the pretensioner and a 10K ohm resistor for seat belt. See picture below. The single transistor is a 10K ohm one, and the serial connected resistors together makes 3 ohm resistance.

Are those 2 1.5ohm resistors together? Any particular reason for doing that or can I just use a 3ohm resistor like you did with the 10k ohm ??

 

[satrya]

Looks like your question was embedded in the content of post #51 that you're quoting, so it looks like you're just quoting the post without mentioning anything. I isolated it here:

Are those 2 1.5ohm resistors together? Any particular reason for doing that or can I just use a 3ohm resistor like you did with the 10k ohm ??

Electrically, two 1.5 Ohm resistors in series should be equal to one 3 Ohm as you said. I suspect @imbilly simply used whatever resistors that are available at hand.

 

[Zamora0214]

It's pretty straight forward to remove the middle seats. There are four hex blots on the floor around corners. Once you remove them, unplug the green connector shown in this picture, and the seat is ready to be moved.

If you leave the connector unplugged, there will be SRS airbag error on the console every time we start the car. We need to "hack" the sensors. It appears that our XC90 sensors are pretty smart, so completing the circuits won't fool the system. I figured that the sensors expect a particular resistance value from the connector. So we need a 3ohm resistor for the pretensioner and a 10K ohm resistor for seat belt. See picture below. The single transistor is a 10K ohm one, and the serial connected resistors together makes 3 ohm resistance.

Once connected and verified no more SRS message. Wrap it up with electrical tape.

Push it under the other seat so we don't step on it.

Cover it with carpet and enjoy the safest minivan

i added the two resistor and the message is still populating ??

 

[PLE229]

Slight variation on this - don’t want to remove middle seat but swap the bottom for one with integrated booster. Found an entire seat bottom from a wrecked car, brand new. Can it easily be switched?

 

[MrM83]

I’ve looked at option of adding integrated booster, including digging into the part numbers. I concluded it was prohibitively expansive based on part numbers and that was mainly driven by the actual seat frame, which is a different part number to one without the integrated booster. If you can get the whole seat assembly you should be fine, but I fear you will need more than just the base cushion part as there’s quite a bit more to it.

 

[Joel Hamilton]

I've been getting a lot of requests for the resistors lately. I figured I'd post a pic of what they look like and how they attach for future reference.

This is a dumb question but do you sell those resistors and know how to reset the seatbelt light without going to the dealership?

 

[theclutch]

This is a dumb question but do you sell those resistors and know how to reset the seatbelt light without going to the dealership?

Not a dumb question at all. I still have some resistors if you want. I don't know how to reset the seatbelt light. I assume yours is "on" now since you disconnected the middle seat without the resistors? Bummer if so. I don't know of any other way to turn it off without going to the dealer.

 

[ktbos]

This is a dumb question but do you sell those resistors and know how to reset the seatbelt light without going to the dealership?

My recollection is that the light went off on its own for me. Not right away, I don't think, but after some time.

 

[Jpark12345]

I just stumbled upon this thread and this is awesome… @theclutch was wondering if you still have any resistors for sale?

I had no idea this could be done diy so I’m really stoked to try it out on my ‘17 xc90. Thank you everyone!

 

[satrya]

I just stumbled upon this thread and this is awesome… @theclutch was wondering if you still have any resistors for sale?

I had no idea this could be done diy so I’m really stoked to try it out on my ‘17 xc90. Thank you everyone!

Make sure you complete the resistor circuit before turning the vehicle back on to avoid the seat / belt related message from sticking around.

 

[Jpark12345]

Thanks @satrya! That would just be connecting both resistors (1k, 2.2) into the plug as shown in previous diagrams/pics correct?

 

[theclutch]

I just stumbled upon this thread and this is awesome… @theclutch was wondering if you still have any resistors for sale?

I had no idea this could be done diy so I’m really stoked to try it out on my ‘17 xc90. Thank you everyone!

Yeap, PM me.

 

[satrya]

Thanks @satrya! That would just be connecting both resistors (1k, 2.2) into the plug as shown in previous diagrams/pics correct?

Yes. If you connect the arms of the resistor directly to the connector, be aware that the resistor arm could be thinner than the socket in the connector. That is why some of the members here buy the matching OE connector so that the pin-socket connection is secure, and then solder the resistor to the wire coming out of the matching connector.

If the electrical connection is intermittent, then the vehicle's system will likely complain about it.

 

[swede4me]

New member here.....been in the market for a while now and finally purchased an XC90. I've been stalking the idea of removing the middle seat and have been collecting all the necessary parts. Very well detailed on here which is great! @theclutch was wondering if you still have any resistors for sale?

 

[theclutch]

New member here.....been in the market for a while now and finally purchased an XC90. I've been stalking the idea of removing the middle seat and have been collecting all the necessary parts. Very well detailed on here which is great! @theclutch was wondering if you still have any resistors for sale?

Yes, I do. Please PM me with your relevant address, etc.

FOR NEWBIES, to avoid adding more "do you have any resistors left" posts which does not add value to the thread, kindly just feel free to PM me directly so that I can help or try to help you.

Also, for the more experienced members, how come this tread isn't "pinned" yet? I would have thought this was "pin" worthy.

 

[theclutch]

I did the 6 passenger modification to my wife's 2017 T6 yesterday. Well, most of it. The plastic covers should show up tomorrow but I have the center seat out, the resistors in place, and floor mat in and it really opens things up! I went with the weathertech mat for the 2020 6 passenger and it looks great! It is one piece that covers the second and 3rd rows and was about the same cost as the factory carpet mat that only covers the 3rd row and between the second row seats. The Weathertech mat is not quite flat between the second row seats but I think that will get better once the car sits in the sun for an afternoon on a warm day. Otherwise fitment is perfect. For now I just wrapped the reisistors with electrical tape but I had my 18 year old son get some measurements and asked that he sketch up a clip for it that he can print on his 3D printers so I hope to have that soon, too. I kinda want to make an excuse to go on a road trip, now!

Thanks @theclutch for the resistors! I really didn't want to have 198 extra one's laying around because with my hoarding tendencies I know I'd never throw them away!

View attachment 115460 View attachment 115461

@PTRL HD , can you take a close up pic of the 3rd row floor? I am wondering if the WeatherTech floor liner/mats go up the wall or not. It seemed odd to me that the Volvo OEM ones don't go up the wall. So snow/water tends to pile up there and cloud overflow onto the carpet area if the 3rd row seats are used all the time. See red area in pic!

 

[PTRL HD]

@PTRL HD , can you take a close up pic of the 3rd row floor? I am wondering if the WeatherTech floor liner/mats go up the wall or not. It seemed odd to me that the Volvo OEM ones don't go up the wall. So snow/water tends to pile up there and cloud overflow onto the carpet area if the 3rd row seats are used all the time.

@theclutch The WeatherTech mats go up a little more than OEM. Maybe an extra inch, or so. Only about to where the red starts in your example pic, unfortunately. (Please excuse the dog hair and road grime in my pic)

 

[satrya]

... It seemed odd to me that the Volvo OEM ones don't go up the wall. So snow/water tends to pile up there and cloud overflow onto the carpet area if the 3rd row seats are used all the time. ...

I suppose the designers assume that no one will rest their shoes on that carpeted ledge. That area is relatively flat, so you can get a generic flat rubber mat and trim to fit that area, extending below the 3rd row floor mat on the bottom and extending below the 3rd row seats on top.

On the sides, you'll need to trim it to fit some of the edges. The bin between the 3rd row seats are mounted somewhere closer to the back, so a thin enough mat don't need to be trimmed to avoid that bin. Instead, the mat can just snugly slide under the bin.

 

[theclutch]

I suppose the designers assume that no one will rest their shoes on that carpeted ledge. ...

Very obvious the designers for this area don't have kids...

 

[satrya]

Very obvious the designers for this area don't have kids...

... or their kids follow orders without the slightest deviation.