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DIY: (w/pictures) Make your SC seatbelt dash light work with a Supra TT seat swap

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DIY: (w/pictures) Make your SC seatbelt dash light work with a Supra TT seat swap

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Old 11-07-12, 08:51 PM
  #16  
xspsi6
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Oh, I am doing this tomorrow! Thank you for taking the time to do this!
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Old 11-08-12, 01:58 AM
  #17  
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I'm happy that you guys are finding this useful! Thanks!

High PSI and to anyone else interested: I checked my records but did not find the receipt with the connector P/N listed. I'm sure it's in there, BURIED randomly in with loads of other parts on an order receipt but I couldn't identify it. When I get some time I'll check the connector on my spare SC driver's seat. Still, I'm not certain they are available to order any longer. Hopefully I'm wrong on that.
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Old 11-10-12, 05:18 PM
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Ok so if I am reading this properly I need to jumper these pins?

I hard wired my power seat functions before I saw this thread however my light is still on for some reason?
I was just jumpering the pins to see if the lights would go off but to no avl Mine is a 97 sc400 if it matters any?
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Old 11-10-12, 07:18 PM
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xspsi6, yes, those look like the right pins to jumper if the angle of the floor connector is right in that picture but that is for TESTING the connection on your car's body plug side, not permanently wiring it on the seat side. There is supposed to be a slight difference between 92-96 and 97-00 wiring, however as StiCk3 explained to me:

(Quote): FOR 97+ OWNERS: StiCk3 noted to me that he "had to connect one end to the black/yellow stripe (12V) wire and the other wire into the white/black stripe (ground). However... there is a difference between the 97+ and the 92-96 wires. If yours is a 92-96 then the power wire is a blue wire/white strip..."

It's still going to be the same principle as before but the color of the wire may have changed once the 1997+ model year cars came in. Use the jumper to test the connection to verify this works on your 97. The dash light SHOULD go off as I showed in my youtube video. If something is different then I'll update the original post for 97+. There is no permanent jumper in my writeup-- just a test with a jumper to the body harness connector.

So in your 1997 SC you are going to use the black/yellow-stripe thick wire as your +12V connection. Main ground should still be white/black. The important wires come directly from the Supra TT seatbelt buckle: black/green stripe which is yet another positive (but not +12V) wire and the black wire.

The buckle black with green stripe positive buckle wire goes directly into the SC seat connector as shown in the pictures.

The black wire is the one you have to splice into the large negative ground wire. You need to extend that wire a bit because it's too short to have any give for a tidy (and safe) connection.

Last edited by KahnBB6; 11-10-12 at 07:39 PM. Reason: edited post for accuracy
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Old 11-10-12, 07:46 PM
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Right I understand it's just for testing but I am looking for the wires to tie together in order to make the light go off for good not to get it working again as I always wear my seat belt anyhow so it's point less for me at this point but my wire colors are totally different than what was told to me in the thread so maybe I will take a good pic tomorrow sometime to help clear up any confusion.
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Old 11-10-12, 08:18 PM
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AH! Okay, now I understand. I was thinking you wanted to replicate the same stock function I did. I always wear my seatbelt too. I just wanted the car to act as stock as possible in regards to electrical function with the TT seat.

To make it go off permanently you will indeed have to create a permanent jumper on the SEAT side connector (assuming you aren't modifying your body harness).

You would have to get a spare factory wire with pin into the SC seat connector slot for the black/green-stripe wire (same as in my pictures on the previous page). Then you take that and splice it directly into the large/thick negative ground wire on the SC seat connector side. That should provide the same function as the jumper test on the body connector side because it completes the circuit.

That's all the seatbelt buckle really does: break the connection until the metal part clicks in.

Last edited by KahnBB6; 11-10-12 at 08:22 PM.
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Old 12-15-12, 03:44 AM
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The SC driver's seat connector should be P/N: E19-10812. This is what was embossed into the connector on my spare SC driver's seat.

If Toyota/Lexus still carries these in their electrical connector database, this should be the one to ask for.

I've updated the original post with this information as well.
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Old 02-13-14, 08:03 AM
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I'm new to this site and had a question about sc400 power seats. I'm installing them in my 69 Cadillac Coupe Deville and I'm trying to see which wires on the seat actuate the slide front and back function so I can tie into to it. Any help or a pin connector plug wiring diagram would help tremendously. Thanks
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Old 02-13-14, 06:07 PM
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Chuck, I can't help you with that but I believe some pin out diagrams for the seats are floating around. The only functions I hooked up were power, ground and the seatbelt interrupt which is basically part of the main ground. Memory functions will not work unless you can figure out how to wire the seat memory ECU into your Deville.

My seats are coming out for recovering soon and I could snap some pictures of the connectors but they will look exactly the same as what I posted in this thread, which is specifically covering the seatbelt warning light on the SC dash cluster.

I would use a generic set of connectors if you are planning a swap like this-- I love old Cadillacs and I wish you luck!
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Old 06-01-18, 08:21 AM
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Thanks, just finished up the seat belt wiring (now plug and play) for the JDM Supra seats. PN: 90980-10812 did the job. OE seats are going up in the attic.
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Old 06-01-18, 11:07 AM
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^^ You're welcome! Glad the DIY helped you! And yes, that's the correct connector part number. At the time I first made this thread I was not aware that the common "90980-" had to be added before 10812.

I should note that if I were doing this writeup over again today I would not use crimp connectors but instead solder and heat shrink tubing for all splice connections.

Don't hold me to it but I may update this thread in the near future with additional info to also include seat heater wiring into that seat-side connector... once I've figured out how to add it to my own SC that didn't come with the option originally.
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Old 06-17-18, 10:11 PM
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I shorted the leads to make the seat belt light always distinguished. If I need to wear seatbelt, there's a pretty good and effective reminder otherwise -- my wife who's sitting next to me.
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