rich22

Guys, Sorry I have been so absent from the forum. I am working on a digital document with instructions/diagrams/etc and trying to get some permission from my friends at GM to release it here. I some assistance figuring this out and I don't want to upset anyone who skirted some rules to be of help. Rich

The cooling is accomplished by 2 in-seat peltier-style thermoelectric air conditioning units. Basically, electric current is passed through in one direction, making one side hot and the other side cold, and a blower motor pushes air across the cold side up through the perforations in the seats. For heating the seats, the system simply reverses the current across the peltier and blows air across the warm side into the seat. One unit is the seat bottom and one is in the seat back.

I didn't know about the cupholders, but I'm definitely interested. Please keep us up to date. For the rear seat - GM does produce a heated only rear seat option for the Escalades and Tahoe/Suburban/Yukons... but their seats are structurally different than the trucks... I do know that the electronics that control the rear heated seats are compatible with our trucks, so I think it would be a matter of getting the rear ac/entertainment controls out of a rear-heated seat SUV, programming that module, adding the wiring and heating elements/sensors to our seats. The SUVs use a system in the rear seats that is nearly identical to the heated-only system in our front seats. I think a factory appearing and functioning install would be quite possible. As far as heating and cooling the rear seats, at that point I think it would have to be custom... I dont see any combination of stuff out of the GM parts bin making that happen.

You'd have to create a spot for the switches... pigtail from the heated switch to the door switch is about is about 1 foot long... 12 pin connector, so it would take a lot of splices to lengthen it, but it could be done if you wanted to mount them somewhere besides the door panel. If you can, pull your drivers door switch out (should just pop straight up, carefully pry around the edges) and see if there is an empty connection on the bottom of the switch, 2 rows of 6 male pins.

Is your interior door handle above or below your armrest? Does your truck have memory drivers seat and power windows? Power yes, memory NO

Does your truck have memory drivers seat and power windows?

GoldBourbon, Bench tested the seats today, only requires a few wires be tied to a 12v always on source, and a good ground. All 12 power movements, including lumbar functions, work in this configuration. Thanks, Richard

It would be possible to wire a toggle switch that would turn on the heated seat elements directly, however, you'd also have to turn them off before they got too hot... one of the things the memory seat module does (in the heated only seats) is monitors the temp of the seating surfaces, and cycles power to the heating elements to maintain the desired level of heat. Making the heat part work like it was designed to from the factory would involve the power window switches being programmed, and the heated seat switch being installed in the door panels. Not impossible... but if you are going that far, you'll get the memory functions anyway, as the driver side heated seat switch also contains the memory seat buttons.

08Z, I think LT2 trucks have a different door panel configuration, with the door handle itself located underneath the door arm rest. The power window switches are a different shape, though they might be the same electronically - I simply do not have a way of knowing. Best case, if the switches are the same, you'd have to create a spot within about 9 inches of the power window switches to mount the heated/cooled seat switch (thats how long the pigtails are that plug them into the door window switches). Then you'd bolt the seats in, and have to make the the memory seat module wired into the GMLAN network properly... I'm not saying its impossible, but it would involve a little bit more fabrication than a truck that already had LTZ interior. Alternatively, you could purchase new door panels, and essentially upgrade your interior to LTZ. Then everything would fit where it needs to. GoldBourbon, There are 3 different power seats (that I know of) that came in our trucks. The first is the LT2-style 6 way power adjustable seat. It can move back and forth, and move the front or rear of the seat cushion up or down. Seat back recline and lumbar are manual. The second is the LTZ style seat, which features 12 way power adjustments - back and forth, seat cushion front and rear up and down, seat back power recline, lumbar in and out, and lumbar up and down. The seats I have seen with these features usually are heated also. My old seats are of this design - charcoal leather, 12 way power, and heated w memory recall. The third seat is the full KB6-optioned heated and cooled seats, they have all the features of the previous model but also the active heating and cooling systems. If you have a fused 12v source, and a ground, I believe you can have all the power and lumbar features in the seats operational. Accordingly, I will bench test the seats I already have out of my truck to make sure this is the case and let you know for sure.

http://www.gm-trucks.com/forums/index.php?...icle&id=759 I added the writeup to the Tech Wiki. I have not had time to create a wiring diagram yet, will try to do that this week. Feedback is appreciated. Richard thanks Richard....I'll check my codes, as for freight, what part of the country are you in? Louie

Louie, I'm in North Florida. Let me know if I can help, if we can ship to a business address it will be significantly cheaper. Trav_13, The only wiring was done at the floor harness/30pin seat connectors on each side. All the communications are done via GMLAN, so the wiring in the doors stays the same. I'm doing the writeup now... flashing was kind of a trial and error session... but what works is using a 2009 VIN from a _non-cadillac_ vehicle that has KB6 seats (Can't use cadillac calibrations because the seats are operated by the HVAC controls on the dash, not by door switches). The door window switches and the new MSM have to flashed. Richard thanks Richard....I'll check my codes, as for freight, what part of the country are you in? Louie

I was in the same predicament, was considering trading in my truck to get the heated/cooled seats, but unfortunately GM does not put them into any truck that can also have the Duramax engine. (As far as I know, you can get them in 2007-2009 Escalade, Escalade EXT, Escalade Truck; 2009 Tahoe LTZ, Yukon Denali, or Sierra Denali. But the Sierra Denali is only a half ton truck and thus has no diesel option.) I'm in the automotive business, and have a relationship with the company who supplies the seats/electronics for GM. If other people decide they want to do the conversion, I will be glad to assist you in getting the seats you want in the color you want. If you want to match your current seat colors in a 2007-2008 NBS truck, you will need the 2009 NBS Truck/Tahoe/Yukon seats... the Cadillac seats use different colors and grades of leather, though functionally they are the same. Thanks, Richard Richard, Am looking forward to hearing about how you did this! I was recently considering an upgrade of trucks in order to get the cooled seats, and a few other various things, but I enjoy projects like this...so if I can get it to work also that would be great....if you don't mind me asking where did you get your 09 Model Seats?

I'm pretty sure that charcoal and ebony are the color. If your truck has the AN3 option code, it should be prewired for these seats. The memory seat module (under the drivers seat) controls all the power/lumbar/heat/memory functions. Making all the functions work requires that you have power windows, the memory/heat seat switch(drivers side) and heated seat switch (passenger side) installed into your door panels, and possibly some programming at the dealership. If you dont care about making the memory seat recall or heated seat portion work, wiring for the just the power adjustable seat/lumbar is quite simple, just a few hot wires and grounds. Everything for the power movement/lumbar is self contained in the seats. $900 for both front seats, plus freight. They are basically brand new seats, complete with the memory seat module and all wiring on both sides. I have a purpose-built shipping pallet for them. I will do a write up on the heated/cooled seat (KB6) install this week and get it posted as soon as possible. I appreciate all the interest. Richard

So it took me over a month to make it happen, but I now have a 2008 Sierra 2500HD with heated and cooled seats!! Seats were sourced from a 2009 Tahoe. Had to install the 2009 heat/cool seat switches into the doors, do some wiring on the seats, and some programming changes. If anyone is interested in this conversion, I'd be glad to write up a howto document. Also, I now have a pair of almost new 2008 sierra charcoal leather seats AN3 heated and full power with lumbar if anyone is interested. Thanks, Richard