97' FZJ80 heated seat install with Toyota horizontal low/high switches

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Congo Cruiser said:
Opened up the center console on my 1995 FZJ80 and found the required receptacles. This will be a great winter project.

Thanks very much @jwilliams.

View attachment 1179842
Click to expand...
I only have one receptacle for driver side. Is that even possible?

B7E395A6-123F-4ACB-9FA1-FC089AEC977C.webp
 
jwilliams said:
Recently installed new leather with heated seat elements.
Here is my video review of the leather and quick look at heated seat switches

This information is for a 1997 FZJ80, I am not sure if all models have the factory plugs under the center console, please check to verify.

PREFACE
The truck has two plugs, drivers and passenger side heated seat plugs in the factory wiring loom located under the center console. If you buy one of the two switches below they come with the correct pigtails to plug directly into the factory wiring loom. The relays are in the truck already and the switches work, meaning that they light up and the high and low function regulates the power to the heating elements.
The power for the high and low heated seat elements flows from the factory loom to the underside of the seat where there is another plug. That plug contains the functions for the power seats...the only plug you unplug if you were going to remove the seat from the truck.

This is where Toyota deleted the pins for heated seats. On the seat side of the disconnected plug there are two open spots for a high and low pin to be added. You will have to tap into the ground at this point as well.

What we do not have from the factory are heating elements in the seats (the part between the foam and leather). This is what you must add in order to make this whole system work.

Basic Breakdown:
  1. Plug Switch into factory loom under center console
  2. Add heated seat elements to the seat. Bottom side you sit on and the back to each seat.
    You will need to wire those together in each seat. You will have 3 wires for each seat (a positive HIGH, positive LOW and ground.)
  3. Add two pins to each open plug under each of the seats, and tap into the ground wire on the same plug.
These are the wires that you have to match the pins that you add to under the seat. From @CycloSteve

White with black trace = Ground - you will need to tap into this one, as it is also used for the powered seats.

Blue with black trace = +12v when you have the OEM/JDM switch in the Lo position

Blue with orange trace = +12v when you have the OEM/JDM switch in the Hi position.

There are some great threads with all the information you would need, but I thought I would try and pull most of it into one thread.
Threads to reference:
Seat Heater Switches



TOYOTA HEATED SEAT SWITCHES
There are two different types of switches:
* Notice that both of these switches come with the correct pigtail allowing you to plug into the factory wiring loom*

Vertical
View attachment 1179323

Horizontal
View attachment 1179324


HEATED SWITCH WIRING LOOM LOCATION ALREADY IN THE TRUCK
There are already heated seat plugs in the factory loom under the center console.
Remove the center console
Look around for three plugs bundled together that are unused. Two are for the heated seat switches to plug into. I believe the third ( on the top of the right plugs in the picture below) is for the center console fridge which was not an option in the US.
Here is what the two look like for the heated switches:
Picture from @Chris FJ80 (link to pictures)
View attachment 1179315


PLACEMENT OF HEATED SEAT SWITCH
I choose to use the horizontal switch and put them next to the rear heater switch.
To do this I cut the wiring pigtail that was included with the switches in half and added 3 feet of wire to each wire. I soldered all of these connections so that I never had to touch them again. Just make sure you join the correct wires.
View attachment 1179329

Here you can see the extend switch installed into the factory loom:
View attachment 1179331
Click to expand...
One plug available for heated seats

5F3DEBAE-D642-405C-9407-566D93DB7480.webp
 
Malandie said:
Mine is 94 and i found 1 plug for heated seats driver side and nothing on passenger side
Click to expand...
Doesn't look like you are able to do it then. Unless you can verify from other sources what that plug is for.
 
Pretty ironic that they didn’t put in the factory switch harnesses in the LX models, given their “luxury” component.

Any LX owners out there go with a full aftermarket kit, switches and all and have a recommendation?
 
jwilliams said:
Recently installed new leather with heated seat elements.
Here is my video review of the leather and quick look at heated seat switches

This information is for a 1997 FZJ80, I am not sure if all models have the factory plugs under the center console, please check to verify.

PREFACE
The truck has two plugs, drivers and passenger side heated seat plugs in the factory wiring loom located under the center console. If you buy one of the two switches below they come with the correct pigtails to plug directly into the factory wiring loom. The relays are in the truck already and the switches work, meaning that they light up and the high and low function regulates the power to the heating elements.
The power for the high and low heated seat elements flows from the factory loom to the underside of the seat where there is another plug. That plug contains the functions for the power seats...the only plug you unplug if you were going to remove the seat from the truck.

This is where Toyota deleted the pins for heated seats. On the seat side of the disconnected plug there are two open spots for a high and low pin to be added. You will have to tap into the ground at this point as well.

What we do not have from the factory are heating elements in the seats (the part between the foam and leather). This is what you must add in order to make this whole system work.

Basic Breakdown:
  1. Plug Switch into factory loom under center console
  2. Add heated seat elements to the seat. Bottom side you sit on and the back to each seat.
    You will need to wire those together in each seat. You will have 3 wires for each seat (a positive HIGH, positive LOW and ground.)
  3. Add two pins to each open plug under each of the seats, and tap into the ground wire on the same plug.
These are the wires that you have to match the pins that you add to under the seat. From @CycloSteve

White with black trace = Ground - you will need to tap into this one, as it is also used for the powered seats.

Blue with black trace = +12v when you have the OEM/JDM switch in the Lo position

Blue with orange trace = +12v when you have the OEM/JDM switch in the Hi position.

There are some great threads with all the information you would need, but I thought I would try and pull most of it into one thread.
Threads to reference:
Seat Heater Switches



TOYOTA HEATED SEAT SWITCHES
There are two different types of switches:
* Notice that both of these switches come with the correct pigtail allowing you to plug into the factory wiring loom*

Vertical
View attachment 1179323

Horizontal
View attachment 1179324


HEATED SWITCH WIRING LOOM LOCATION ALREADY IN THE TRUCK
There are already heated seat plugs in the factory loom under the center console.
Remove the center console
Look around for three plugs bundled together that are unused. Two are for the heated seat switches to plug into. I believe the third ( on the top of the right plugs in the picture below) is for the center console fridge which was not an option in the US.
Here is what the two look like for the heated switches:
Picture from @Chris FJ80 (link to pictures)
View attachment 1179315


PLACEMENT OF HEATED SEAT SWITCH
I choose to use the horizontal switch and put them next to the rear heater switch.
To do this I cut the wiring pigtail that was included with the switches in half and added 3 feet of wire to each wire. I soldered all of these connections so that I never had to touch them again. Just make sure you join the correct wires.
View attachment 1179329

Here you can see the extend switch installed into the factory loom:
View attachment 1179331
Click to expand...
Do I need a specific heater kit for this or will a generic version work?
 
JoeW said:
I used the Dorman kit from Summit tied to oem seat harness and switches and they work great. In all of my seat heat switch searching I ended up with a couple of extra horizontal switches if anyone's looking for switches.
Click to expand...
How much u letting that go for?
 
JoeW said:
I used the Dorman kit from Summit tied to oem seat harness and switches and they work great. In all of my seat heat switch searching I ended up with a couple of extra horizontal switches if anyone's looking for switches.
Click to expand...
Did you use the relays from the kit or ditch them? My passenger side is working but my driver's is not. HI does nothing and LO immediately blows the fuse. I'm wondering if it wouldn't be better to ditch the relays. My kit is different but functions about the same way. OP ditched relays, so I'm curious if you were successful WITH the relays.
 
Dirt Ferguson said:
Pretty ironic that they didn’t put in the factory switch harnesses in the LX models, given their “luxury” component.

Any LX owners out there go with a full aftermarket kit, switches and all and have a recommendation?
Click to expand...
I was considering doing this on my LX, didn't realize we don't have them. :(
I suppose you can install the factory switches and just wire them up yourself. Do they need a relay? Wonder where we can buy the plug ends with pigtails so we can plug it into the factory switches?
 
b16 said:
I was considering doing this on my LX, didn't realize we don't have them. :(
I suppose you can install the factory switches and just wire them up yourself. Do they need a relay? Wonder where we can buy the plug ends with pigtails so we can plug it into the factory switches?
Click to expand...
I didn't care about stock switches which i can adapt on my aftermarket carbon seat heaters from amazon using relay.
 
MWaltz said:
Did you use the relays from the kit or ditch them? My passenger side is working but my driver's is not. HI does nothing and LO immediately blows the fuse. I'm wondering if it wouldn't be better to ditch the relays. My kit is different but functions about the same way. OP ditched relays, so I'm curious if you were successful WITH the relays.
Click to expand...
I did not use any of the kit relays, only the ones that are already built into the LandCruiser. I had a similar issue but it was because I wired the heaters wrong. I misinterpreted how to wiring them in series and was backfeeding the low and high circuits and would pop the fuse on Hi. Here is a crappy little schematic on how they are wired into my car.
1617216629322.png
 
JoeW said:
I did not use any of the kit relays, only the ones that are already built into the LandCruiser. I had a similar issue but it was because I wired the heaters wrong. I misinterpreted how to wiring them in series and was backfeeding the low and high circuits and would pop the fuse on Hi. Here is a crappy little schematic on how they are wired into my car.
View attachment 2631870
Click to expand...
Thanks a lot for the diagram - that looks simple enough for even me to follow and like it may just get me going! I'm pretty inexperienced and have one follow up question. With this setup, do you not have an issue with current going back into the switches? For example, on HI it goes to both pads in parallel, but the right side in the diagram is grounded and the left side feeds back into LOW. On the right there's a ground, but on the left does it ground at LOW since that switch is off? Thanks for helping a new guy out!
 
JoeW said:
The diagram is for one seat, back rest and seat bottom, not left and right.
Click to expand...
Sorry, I didn't explain my self super well. By right and left meant the pads on the left and right side in your diagram, which I understand are actually just the two pads in one seat. What I mean is, since in HI the back and the bottom are both getting 12V in parallel, do you not have a problem with current going back into the LOW switch in the pad on the left side in your diagram (regardless of what pad that is - back or bottom). The GND in your diagram comes out of one pad, but the other doesn't have a dedicated GND. Or, since the LOW switch is off, does that serve as a ground when HI is engaged?

This is me showing off my electrical ignorance.
 
MWaltz said:
Sorry, I didn't explain my self super well. By right and left meant the pads on the left and right side in your diagram, which I understand are actually just the two pads in one seat. What I mean is, since in HI the back and the bottom are both getting 12V in parallel, do you not have a problem with current going back into the LOW switch in the pad on the left side in your diagram (regardless of what pad that is - back or bottom). The GND in your diagram comes out of one pad, but the other doesn't have a dedicated GND. Or, since the LOW switch is off, does that serve as a ground when HI is engaged?

This is me showing off my electrical ignorance.
Click to expand...
I can't explain WHY it doesn't backfeed in the configuration its in, but it does not. Like I said, I had initially misinterpreted/ wired them with my logic (which is similar to yours) and it backfed the switch, illuminated both HI and LOW switches in the low position and blew the fuse in HI (or maybe it was reverse order) but I just hooked them up how they come in the box and they have worked great ever since. I basically just cut out the relay, switch and anything so it was just the 3 wires shown. I don't know the exact logic of the ENTIRE seat heating schematic, but it works in this configuration. Sorry I can't be of more in depth explanations.
 
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