Few quick questions for anyone who's swapped 8th gen Si seats into their Fit:

- Do both coupe and sedan seats fit into the Fits?
- Is the wiring for both seats plug and play? I've gotten conflicting answers from some of the threads I've read.
- Is it possible to install the Fit seat bracket on the Si seats?

Thanks in advance - I'm looking at picking up a set of seats from an 09 Si but I was iffy on the wiring and fitment since it's a coupe.

 

subscribed.

 

also subscribed... i have a feeling my seat needs replacing soon, though seeing as how the fit gas tank is right under the front seats, i'd be curious what kind of fitment issues there'd be...

 

The passenger seat is not plug and play, different weight and position sensor than the Fit and will set the airbag light off. Driver side is fully compatible. I can't remember if rails swap between the seats but at least I got half the question answered.

 

As for the passenger side the wire for the airbag itself is the same right? I know you should never repair or repin airbag wires or impact sensor connectors but if all a occupancy sensor does is detect weather someone is sitting in the seat surely I could repin the connector to connect to the Si seats if the wires are the same?

And thank you, it does help. I'm picking up a pair of Si seats on Thursday so I'll have a reference to go off soon.

 

So this is my memory at it's limit and verging on misinformation (full disclosure I can't find proof of what I say) but I think the problem isn't the pin or connector but that the seat sensor uses a different reference voltage than the Fit, and that's why it sets off the SRS light.

Some time ago there was a thread here who had a guy deep dive into mending the seat compatibility.

 

Red, you did indeed say the reference voltage was different back in 2020. When you said someone dove deep and that you couldnt find the thread I got to thinking.. about threads that have tons of good information but that I've ignored because of how freakin big they are. Now let me ask you: What did you do to your fit today?

Some dude named Chantastic (i think that's the correct spelling) wrote this:

Just as a heads up, as far as I know when that airbag light is on, the passenger side will not deploy. I am running 08 Si seats in my 13, swapped the driver side position sensor over, and the control unit. Airbag light is on, and I thought it was just needing to be recalibrated. Took it to the dealer and the system is not communicating at all. No airbag deployment as a result.

I need to acquire a '13 seat (not a 09-11) and take the weight sensors out, and the ODS. I'm not sure about the side airbags.

And I believe Team Kitty (again, spelling?) I believe did the swap and said it was an uppercase B. I'm too freakin busy with moving AGAIN and doing home repairs to dig deep here, but those two names should be solid leads to finding the seat info on here.

Please, somebody link me to good plumber's forum!

 

Wow glad I randomly decided to jump on here and see this thread. So I have a bit of update. Please note that my car has been in the shop for a long time (K swap!) so I haven't been able to work on the seats. However, I did have a chat with someone with a 2013 Fit with 08 Si seats installed (exact same setup as me) with NO airbag light! Not sure if he is running coupe or sedan seats, or if there is any electronic difference there.

Apparently all he did was swap the silver box from the original Fit passenger seat into the Civic passenger seat, used the Fit seatbelts, and plugged everything else into the Fit harnesses coming from the floor, and then had the airbag light reset.

The only difference in my setup was that I took the driver side Fit position sensor and plugged it into the driver side Civic seat. Apparently you don't need to do that (that's what you do when running aftermarket seats). I took it a step too far. When I get my car back (hopefully next week) I'll try and find some time to remove the position sensor, and try resetting the light. I'm not sure if you need special electronics to reset the airbag light, or if you can just use the cheap smart phone apps which is what I have. So to clarify, apparently the weight sensors do not need to be changed, nor calibrated!

I'll report back as soon as I can!

 

Very good info, thank you for that. That would make sense actually, the sensors for the ODS are probably the same but the control module is probably different internally. When I get home I'll see if I can find a wiring diagram for the ODS controller in iN to confirm the connectors are the same.

As for reseting the airbag light I'm not entirely sure - any time you touch the ODS system on the passenger side Honda wants it to be recalibrated. Similarly with the airbag light you would want to reset it through HDS but a OBDII reader might work?

Unfortunately the guy who I was supposed seats from flaked so I'm currently without Si seats. However when I get them I'll update this thread -- I can give resetting the airbag light a shot through an OBDII reader but if it doesn't work I have access to dealership software. If it ends up working I'd imagine most dealerships would be willing to reset the airbag light/calibrate the new ODS for pretty cheap. It would probably be half a hour of labor.

 

Scratch that -- found a set for basically the same price as driving 4 hours to the nearest pair of Si seats on Ebay. Should have an update for this thread in a week or two.

 

Looking forward to an update!

 

Seats appear to be arriving Thursday which is also my day off -- nice little coincidence. Hopefully I'll at least be able to get the drivers seat in on Thursday.

Regarding the ODS, I had a look in SIS for the procedure for replacing the ODS module. Interestingly, this may only work with 09-10 Fits as the number of connectors on the ODS module appear to be different than the Si's. First image is the Fit ODS, 2nd is the Si as they display in SIS

I didn't check and confirm if each connector had the same pins but considering they're illustrated the same I'm pretty sure they are the same. Chantastic if you get another chance to talk to that guy I'd be curious to hear what he did.

 

Small update -- at the very least the drivers seat does fit without issue. No airbag or SRS light illuminated.



For the drivers seat I found that the airbag wire was the same between the Fit and Si seats, however for my seats the wire connecting the harness to the position sensor was different and the seatbelt buckle was different. Interesting the driver position sensor is the same between the Si and Fit seats (same PN and everything) but the connector that connects it into the harness is different.



The connector on the right is the Fit position connector, connector on the left is the Si connector on the side that plugs into the harness in the carpet. It's pretty easy to trace the drivers side connector down into the seat rail once you have the seat ou of the car. Same deal with the seat belt, it's as simple as removing 2 plastic clips and a bolt to switch out the seat belts between the cars. Interesting as well I found out the rails are more or less identical between these seats, the only difference is the feet. Because Honda wants dealerships to replace the entire seat skeleton (and not feet/rails) the feet are held in with rivets. I simply cut the rivets out, swapped the feet and replaced them with grade 8 bolts. I had to adjust the feet some in the car because I accidentally enlarged the top holes some but they bolt up perfectly regardless.



Overall it took me about 6 hours of focused work/effort but most of my tools are at work and I was recovering from the flu while working on this so I wasn't at full capacity. That and I was scared of breaking plastic LOL. I figure if you know what you're doing it's a 2-3 hour job max. Overall the fitment of the seat is good, it fits just as well as the stock seat but with way more support. I've never really owned a car (or driven a car) with bolstering that really holds me and these feel awesome. They're good enough to the point where they made me reconsider whether or not it was a good idea to have the stock seats in my Miata reupholstered. I'm actually able to chirp the Extreme Contacts on my Fit now in corners because I'm not fighting with myself while cornering. I suppose my only real complaint about them is the lower back area is a lot stiffer than the stock seats but I think I'll get used to it. I haven't taken any long drives in this yet, everything has been a hour or less.

I'll be swapping the passenger seat in the future but I have other projects to attend to first. When I swap the passenger seat I'll update this thread.

 

Tremendous work good sir. I've wanted an SI seat for a while, this might push me over.

 

@oldyeller: Good for you, pal. I don't think I'd have the patience to go through all that. I need a drop-in seat replacement. It's just a seat, for crying out loud. Why do they have to make things so hard?

If I have my OEM seats reupholstered, it's a day, or days, without my daily driver. Really sucks.

 

Generally engineers "make things hard" for a reason, it isn't like they - or car brands - are out to spite the end user. For some reason car guys think that a lot. Like the feet are probably different because the Fit has the gas tank under the drivers seat. And frankly it's lucky Honda used rivets and didn't weld the feet to the rails like most other car manufacturers.

 

I like this guy

If you can, let us know if the new seat is a little easier on you comparitively after a longer ride. I'm on the boney side, and after an hour in the stock one my ass is kinda sore. Wind up slouching, which screws my shoulder up, then i have to take my anger out on my loved ones. Help me help them 😂

 

Good stuff! No updates on my end yet, wiring troubles in the kswap.

Anyway, speaking about reupholstery, does anyone know if there is a company who makes a new, fabric replacement for the Si seats? I've only seen leather replacements by Clazzio and Katskins.

 

1) Simplicity is a design virtue. 2) Uniformity of "feet" and "plugs" lower manufacturing costs.

There are arguments on both sides. Perhaps you are right. But I will say this: All other things being equal, the Japanese engineering strategy tends toward solving problems with complicated (but often marvelous and elegant) solutions. They revel in intelligence, skill, audacity, and ambition. Sometimes, they get a design brief from corporate HQ, and what comes out the other end is something marvelous but straightforward (if not simple), like the S2000. But, generally, it's not in the Japanese nature to say, "If you want to cut something, any knife will do." Or "If you want to drink tea, just throw some tea bags in boiling water and you're done."

Let us know how the new seats work out. Details, please.

 

I feel that. I'm 6'6" 160lbs so very much on the skiny side as well. I coped with the stock seat alright, my longest drive in that was like 8 hours and it wasn't too uncomfortable for me. Though if you're having discomfort with the stock seats I dunno if I can really recommend the Si seats -- they're straight up stiffer and feel like they have less padding compared to the stock seats. Though everything I'm writing here applies to all 8th gen Civic seats, not just the Si seats -- if you find a set of 8th gen seats you like you could always swap them too.

I totally agree with your first point but I think you're missing the bigger picture with your second point. Like I said I'd wager that Honda designed the Fit's feet the way they are because of the gas tank or some sort of similar chassis consideration. I really doubt it would be cheaper for them to completely redesign aspects of the Fit's chassis to incorporate Civic seat feet. The seat feet are held on by rivets -- during manufacturing the seat feet are practically interchangeable and I really doubt it adds any cost to not share the part, especially when seat feet are not serviceable by dealers. By that logic why didn't Honda use the same seat between the Fit and Civic if the seat rails are the same?

And for sure. Probably won't be doing the passenger seat till next week.