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#1
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Factory heated seats in w123 ... anyone know about them?
So, after not having a big project in a while, I have finally started taking apart the 78 240D for a restoration that I hope will not devolve into a part-out. I finally (only took me 10 years) learned to weld and once I finish my MIG class and do a little practice on body scraps, I plan to address the rot on the car ... another thread on that down the road.
My mini-project for now is I would like to rebuild the driver's seat and hopefully return the factory heated seats to function. Kind of putting the cart before the horse but even if I never finish the car I want these seats for something. Has anyone actually worked on or disassembled the heated seats and circuit from an early 123? Or better yet have a wiring diagram? I only have the Haynes diagram which does not include heated seats, and Google searched have not been fruitful. I'm assuming I can just take it apart and figure it out as I go, but I'd rather know what I'm looking for ahead of time if possible. I have never tried the seats. When I bought it, the seller told me he didn't use them because when you turned it on, the radio shorted out. I have since found the driver's heat element was not plugged in under the seat, and the wiring from the bottom cushion to the back cushion is chopped in half. I may just have to trial and error it ... fortunately not much electrical in this car so maybe it will be obvious when I pull the console out. Nonetheless I'd appreciate any input or troubleshooting tips. If not I will try to document what I find for future reference.
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1987 300D, arctic white/palomino--314,000 miles 1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles 2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles 2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles 1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles 1995 S320, black/parchment--34,000 miles (Dad's car) |
#2
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That is a cool feature! I want to add them, even grabbed factory w126 seat heater switches to install.
The main issue with seat heaters, from the little I have read, is that the elements burn out. The seats take a lot of abuse and usually the thin elements sewn into the seat skins don't last. Before you try to fix them, take an ohm meter and measure the elements for resistance and if they measure open...well time to move to another project..
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#3
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Quote:
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1987 300D, arctic white/palomino--314,000 miles 1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles 2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles 2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles 1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles 1995 S320, black/parchment--34,000 miles (Dad's car) |
#4
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AFIK, there are aftermarket elements you can put in with the stock switches. I've never seen them, but heard about them. I've seen them for sale from time to time and they aren't terribly expensive.
Dkr. |
#5
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I checked resistance and got .5-.6 ohms on the plug going into the bottom (when putting the meter leads on the wire ... the plug itself was kind of dirty and couldn't seem to make connection), but 5.9-6 at the severed wire going to the back. Not sure what to make of that, maybe the back element is bad, though you'd think it would be the other way around.
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1987 300D, arctic white/palomino--314,000 miles 1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles 2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles 2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles 1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles 1995 S320, black/parchment--34,000 miles (Dad's car) |
#6
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.5 ohms is a dead short... don't plug that in...
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#7
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Don't hold your breath waiting on aftermarket seat heaters that will work with your switches I tried that to no avail for over a year. When a person forgets something in the car ap kneels on a seat to reach it is the death of many seat heaters.
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92 e300d2.5t 01 e320 05 cdi 85 chev c10 |
#8
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Will the dorman pads work? I've got them in one of my cars, going strong after 2 years of abuse.
http://www.amazon.com/Dorman-628-040-Universal-Seat-Heater/dp/B002U6IL9O
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$60 OM617 Blank Exhaust Flanges $110 OM606 Blank Exhaust Flanges No merc at the moment |
#9
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Quote:
comes with the rings, and the pliers and the wiring and the relay... hard to imagine how you couldn't make those work!
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#10
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I saw a source on youtube that said he fitted newer seats in a 126. Then I remember Roy saying that he's had difficulty getting the newer seats working electrically. Some features can be made to work and later model seats are more comfortable than the early seats but there are now wiring diagrams specific to the seats. Perhaps the same applies to a 123??
I intend to try later models in my SDs even if I end up swapping the motors and wiring over from the originals.
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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do. |
#11
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I've seen w140 seats in a w126 SEC convertible before, not sure how hard that was, but it looked great. I had the opportunity to sit in some mint w140 seats in my local junk yard before it closed down (the last good one near me *sob*) and I was shocked by how incredibly comfortable they were.
As for the w123, you can fit W126 electric seats in them physically, its just tricky finding a spot for the controls. This would give you electric\heated seats
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2004 F150 4.6L -My Daily 2007 Volvo XC70 -Wife's Daily 1998 Ford F150 -Rear ended 1989 J-spec 420SEL -passed onto its new keeper 1982 BMW 733i -fixed and traded for the 420SEL 2003 Volvo V70 5 Speed -scrapped 1997 E290 Turbo Diesel Wagon -traded for above 1992 BMW 525i -traded in 1990 Silver 300TE -hated the M103 1985 Grey 380SE Diesel Conversion, 2.47 rear end, ABS -Sold, really should have kept this one 1979 Silver 300D "The Silver Slug" -Sold |
#12
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OK, well that explains that then! What would a good reading be? I haven't tested the passenger seat yet. If the passenger seat tests good, could I put the seat skin from that on the driver's side? If not I will just put them together as is (not plugging in the seats) and forget about it while I fix the rest of the car. If I ever get it driving again I will celebrate by installing aftermarket units if that is indeed possible.
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1987 300D, arctic white/palomino--314,000 miles 1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles 2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles 2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles 1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles 1995 S320, black/parchment--34,000 miles (Dad's car) |
#13
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Quote:
__________________
1987 300D, arctic white/palomino--314,000 miles 1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles 2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles 2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles 1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles 1995 S320, black/parchment--34,000 miles (Dad's car) |
#14
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Quote:
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
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