Nice work

Have you enquired as to price and availability?

 

Going to try and source them in Japan (need some other OE parts) and have a load sent over. You don't have any contacts in Toyota parts do you? lol

 

I've compiled a list of parts I think are needed to do an OE retro fit of the heated seats or heated steering wheel. I'll update this list if I find any others.

I won't know if the it's a universal wiring loom until my car arrives (in port) but I very much doubt it. Would be something of a home goal for Toyota Europe/UK if it is!!! I understand heated seats has been removed from ALL UK specs? Either way It's won't be hard to make a sub-loom.

View attachment 1218

Again great work I thought they all had the heated steering wheel?

Will have a look at mine tomorrow, not something I'm bothered about it if I'm honest, they seem to change specs as they please.

 

Well... there are sellers on YJA selling OE parts.

I’m looking at some OE wind deflectors at the moment, but they’re £140 a side before forwarder commission, shipping and duty!

 

Will probably just wait for Fensport to get their container. Guy was saying it's been a bit of a mess. Some part coming under TRD (which they sell) and the rest coming under Gazoo brand.

 

Does anyone know yet if the original uk seats have the factory heating elements fitted already, but just aren’t wired up ?

 

Good question Jeff, I'm asking the same.
Thanks Commitconfirm for finding the part numbers. My original thought several weeks ago was to buy the oem switches then get a professional company which only fits heated seats to do the work, but if I can get it done using all oem parts I'll be extremely happy ?

 

Five un-populated fuse ways on the internal CP fuse box, nothing listed for those seat heaters or steering wheel.

 

Five un-populated fuse ways on the internal CP fuse box, nothing listed for those seat heaters or steering wheel.

View attachment 1226

The fuses for the heated seats are in the fuse box in the engine compartment.

10A - ECU-IGP NO.3 -> Seat Heater (RHD)
100A - INP STD NO.1-1 -> Seat Heater (RHD), Seat Heater (LHD)

No idea why the RHD version has two fuses. But even without seat heating the fuses are already there as they are used for a lot more stuff.

 

Thanks for looking into this - it would be great to be able to use the OE switches etc. I'm always cold so would be great to have the heated seats and wheel!

It looks like the central switch panel where they fit is different in the UK cars too? I don't have a picture to hand but the switches seem to sit towards the outside edges but the UK panel blank looks different with no cut outs for them to fit into, so maybe that whole switch panel would need to be changed to?

Another thought, I think some of the EU cars have them fitted, in Germany and elsewhere, might it be easier to get parts from there in future rather than Japan?

 

It will at least be easier to get the cabling for the RHD version installed. LHD might fit, but there are a lot of differences when it comes to component placement and cabling in general.

 

Anyone got a German VIN we can use to look up parts. A photo of the fuse box cover from a LHD would also help.

 

Have you got a pic of the interior switch panel please @Chris64? I don't get my car for another couple of weeks.

Anyone got a German VIN we can use to look up parts.

I don't have my car yet either but I've Googled some pictures just now and found three different versions?! But perhaps one is the pre-prod?

This is what I think the UK car looks like:

There's the USB on the left and is that a light up display in the centre? Think I've seen some sort of orange warning light/text there?

Then there's this version with heated seat switches:

And this version?!

Maybe that's one of the differences between LHD and RHD?

 

UPDATE: This is why I love forums like this, power of the hive mind. Having reviewed Toyota-tech I think I know what's going on. For whatever reason the 4x RHD markets in the EU simply don't have it. Only RoW and LHD EU6 have it. All EU6 cars have a different switch layout (airbag light) than ROW cars. Short answer the RHD diagram is RoW. The LHD wiring diagram is the one to go off for EU6 cars. Assuming we can make the buttons fit.

I'm not going to post the wiring diagram for fear of copyright infringement. There are interesting differences for heated seats between LHD and RHD cars.

For RHD the 10Amp fuse is shown to supply power to 'No 6 Junction Controller' on Pin 1 of white connector A (brown wire). From there pins 9&10 on black connector B (light blue & black respectively) are the ignition side 12V+ to the switches. I believe Junction Controller 6 is up in the nsf passenger footwell.

The 100Amp fuse supplies power to the 'IC' - I think this is the relay module - from this pins 6&7 (green, black) on the grey connector 4B carry battery side 12V+ to the switches. The other two pins 39&40 (blue, grey) on the white connector 4C are the load side 12V+ to the cushion element. The seat back connects to the cushion.

On the LHD diagram both 10A and 100A fuses wire direct to the 'IC', with only two pins, 39&40 (green, red) on the white connector 4C wire directly to the switch. The seat element are wired direct to the switch for both High/Low as above.

What's interesting between the two diagram I'm looking at are:
A) For RHD the switches are 'cold', they only switch a relay. The heater elements are wired to the battery. For LHD market the switches are 'hot' meaning the heat elements load runs through the switch. This could explain why there are different part numbers for LHD and RHD switches.
B) For RHD switch internals require 12V+ on both inputs (ignition & battery) to work. For LHD it's only battery 12V+
C) RHD market appears to have only the High heating element, the Low element is wired to chassis ground.
D) Both markets 'IC' shows a pair of relays 'S/HTRF/L & S/HTRF/R, one for each seat. Probing any empty relays for a battery and/or ignition 12V+ would save having to run new supplies.

It's my experience that, unless one's a sadist, wires are omitted rather than circuits re-drawn. ie, it may be possible to simply wire in these empty pins for an OE quality retrofit. Assuming I can get it working, and maybe someone beats me to it, and we don't have to hack into anything I'd consider making up sub-loom assemblies for anyone who wants one.

 

The warning lights are to do with the passenger airbag deactivation.

 

Hum - I think more research is required. A couple of things stand out to me from these pictures.

First, LHD and RHD have the airbag warning and USB ports on opposite sides. This might, for some, rule out using the LHD market switch panel. Also, hard to tell if the shape of the centre console means the assembly might not even fit.

Secondly, the LHD/EU spec switches are a different shape to the RHD/JDM spec. Unless there is a Malta specific RHD model which included Heated Seats we might not be able to make an acceptable OE solution. I believe SA, AU, NZ are getting JDM spec (no Euro6) and thus would expect them to have the middle picture (speculation).

This would explain why the 'RHD' diagram is wired for only the High element. The switch in the middle picture is on or off. Only the 'LHD' picture has a High/Low setting. Therefore, assuming we can make the buttons fit, I'll be going off the EU6 LHD wiring diagram.

 

Very interested in this thread. As an ex Peugeot Master tech of some years, I have experience of stripping/rebuilding seats, and have the tools to do so. As soon as my car arrives heated seats are on the list.

 

I bought some aftermarket seat heating kits for my Honda S2000 some years ago, never got round to fitting them for fear of destroying the seats, sold them on Ebay for a modest loss when the car went. Be interested in this thread in future, her indoors always has a cold bum!

 

Been quoted £145+VAT each of the two switches. £38+VAT for the base assembly from a local Toyota dealer.

I've order the base assembly to see if it fits.

 

Been quoted £145+VAT each of the two switches. £38+VAT for the base assembly from a local Toyota dealer.

I've order the base assembly to see if it fits.

CC, do you know if the switches (LHD ones for a potential retrofit here I guess?) are used on any other Toyota model?

 

What is the base assembly @CommitConfirm ?

 

The plastic trim the switches go in.

 

ah ok thanks

 

Following with interest. Heated seats and wheel are a completely unnecessary indulgence, but I reeeeeeally want them!

 

Me too, I absolutely must have heated seats. ?

 

I would have loved heated seats in mine. My last car (GT86) had them and I used them all the time. I was thinking about retrofitting them, but now I've had the car a month, I don't think I'll bother. Reason is, the seat has Alcantara on all the touch points including the side bolsters so it isn't that cold when you get in. The heater comes on within a mile of driving and it is extremely powerful with a real punch to heating up the interior. I think with my old GT86, you had to rely on the seat heater as it took a lot longer to get heat out of the blower.

 

Most cars heat up quickly these days, its all about the emissions.

 

Heated steering wheel will cost much more than the heated seats
I m looking for informations about connections
Parts are easy to Order. Making it work will be a real challenge

 

My car is due to arrive May/June, and especially given the weather right now, I desperately want heated seats! I've retrofitted heated seats in the past (Ford) using completely OEM parts, so will be happy to do it on my Yaris if the "how" is worked out!

 

I'd be more interested in a heated steering wheel. Having driven in the cold snap recently the seats aren't cold at all being fabric. The wheel on the other hand is the coldest I've ever used!

 

I'm fortunate that my current car (Focus RS) has both the heated seats and wheel. I'd like the heated wheel too, but I suspect that will be pretty expensive!