When I was looking for these years ago, they were nowhere to be found. Literally, nowhere and the proverbial "unobtanium". Now, I found all sorts of W123 heated switches with the correct pigtails. Finding the rear seat B-pillar pods is a different story, but I think I have a solution. The wiring harness looks simple enough. But, I found the correct type of plugs, so I can mount the plugs to the pad's wire leads, and do the wiring down the road when I do the Feintuft Velour carpeting.

This is what the wire harness that the wire harness for the rear seat heaters attaches to looks like. The little ground wire on each harness attaches to a ground screw behind the instrument panel.


Here are pages from the W116 factory service manual. Maybe they will help with making a wire harness, since the wires tend to criss-cross as there is both a high and low heat setting.




There are also lightbulbs inside, which can be removed by carefully prying off the switch top and using a piece of hose.


I had a Milan Brown 1979 W116 300SD and then bought a Cypress Green 1979 W116 300SD parts car. The parts car had front and rear seat heaters from the factory. I removed them and intended to install them in my brown 300SD, but ended up selling it to try to raise money to get a decent fintail.

I listed the seat heater parts for sale and didn't get any interest except for a local person who wanted them for a W123 300CD. He bought them along with the orthopedic seat parts.

I ended up getting my current black (was originally Walnut Brown) 1980 W116 300SD, and the person who bought the seat heater parts gave the rear harness and B-pillars back to me. I ended up finding a front wire harness on this forum from a W116 6.9 that someone was parting out. Someone on W116.org was pulling parts from a 6.9 a year or two ago, and I encouraged them to remove the complete seat heater wire harness, but it didn't happen. I feel bad, because right when I was getting into Mercedes, I parted out a Euro-spec 1977 W116 450SE which had a front seat heater, but I didn't pull the wire harness and gave away the shell.

Then I installed the wire harnesseses from the green parts car in my 300SD--but instead of using the auxiliary use box, I just wired them into the #15 and #16 fuses for the power windows, since I deleted them.

Attached Thumbnails

         

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1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
1980 W116 300SD Turbo Diesel, DB479 Walnut Brown, Sunroof, Highly Optioned, 350,000+ Miles

Those are not the switches I have typically seen in a W123 (at least the later ones). They might be for the earlier style center console or for a W116.


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1985 Euro 300TD Turbo

The small orange-reddish squares are the only ones I have ever seen in a W123 sedan and the ones which the German W123 Club reproduced. The black switches with a seat icon would not be the correct ones for a sedan or coupe

I’m not sure as I only really ever worked On the 83-85 cars. Here are some pics from an 83 brochure.



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1985 Euro 300TD Turbo

I've seen both switch styles in W123's. The later production W123's had the long black switches. It would likely have coincided with the other switches changing shape.

__________________
Stop paying for animal enslavement, cruelty, and slaughter. Save your health and the planet. Go vegan! I did 18 years ago. https://challenge22.com/

DON'T MESS WITH MY MERCEDES!


1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
1980 W116 300SD Turbo Diesel, DB479 Walnut Brown, Sunroof, Highly Optioned, 350,000+ Miles