99 Suburban heated seat

djones64 · #1 01-05-2005, 03:36 AM

Can anyone tell me why the driver's side heated seat does not work, but the passenger's side does on my 99 Suburban, K2500, LT?

777stickman · #2 01-06-2005, 12:11 PM

Howdy: It could be any of these things: 1.) The switch. 2.) the Left Front control module. 3.) The seat elements. 4.) wiring problems. A module check can be done by swaping the left and right ones. They are located under the seats.........Steve

djones64 · #3 01-06-2005, 04:36 PM

What does the module look like?

777stickman · #4 01-06-2005, 08:09 PM

Quote:

Originally Posted by djones64

What does the module look like?

Small. About 2" square. Located at front of seat below cushion. Looks like a bear to get to. Good luck.........Steve

djones64 · #5 01-21-2005, 05:22 PM

I am sorry man, I am not finding it. Do I have to take part of the seat apart to get to it or should I be able to see it? Thanks again, Dan

777stickman · #6 01-21-2005, 10:24 PM

Dan: I couldn't see mine either, but I could feel it. The book says to remove the mounting bolts and tip the seat back for access. Mine was in the center above a cover of some kind. Follow the wires, six of them. Orange=12v hot at all times from the "front heated seats" fuse under the hood. The rest are yellow, black, Lt blue, Lt blue/black and pink/black.
Steve

djones64 · #7 01-22-2005, 12:45 PM

Steve,

I FOUND IT!!! Now that I found it, do I really want to dig into it??? Ha. I am trying to sell it and wanted to fix this first... hmmm It looks like someone else has already gotten into it at one time. If I am going to take practically pull the seat out I think I am going to find out how much the element cost and maybe just go ahead and replace it, if it is not too expensive. I am definetely not going to remove the left one to try it in the right one.

Thanks,
Dan

djones64 · #8 01-22-2005, 12:46 PM

Steve,
I forgot to ask, what book are you using for the information?
Thanks again,
Dan

chuck's · #9 01-22-2005, 10:28 PM

Dan,I don't know if you recieved my e-mail about heated seats,but to replace the element,GM sells the entire cushion to replace the lower heating element.It's very expensive.It may be posibble to get just the element from your local parts store,but either way the job will involve tearing down the seat to replace the cushion assembly or just the element.A quick check to see if the module works is to turn the ignition on,seat belt buckled and then turn the switch on.If you don't hear a slight click sound(module relay energized),you have to make sure power is getting through the seat switch and the seat belt buckle switch.By using the passenger seat module you will be able to find out if the seatbelt switch and seat switch are functioning properly.If this works,the modules are not all that cheap either.I was quoted 100 dollars from GM.I was able to locate GM modules(25638146) at a discount store for less than 20 dollars.If the module does energize,the problem will be the lower seat heating element or the thermostatic switch within the heating element.With a break in either component,the circuit has an open and the seats will not heat up.I hope this helps to get your seat fixed.
chuck's

777stickman · #10 01-23-2005, 06:42 PM

Dan: 1998 Second Edition C/K Truck Service Manual. My Sub is a '99 by VIN although it was made in early '98. That's why I got the '98 Manual and so far it's been pretty good.

bn2wild · #11 01-28-2005, 07:09 PM

I have a '99, one of the earliest, I took receipt of it in June of 1998. I had the same problem in 1999. The dealer replaced the whole seat lining/cover to fix the heater. Both seats were fine until around 2002 - then the passenger seat started working for everyone except my girlfriend. The only thing I can figure is she is too light, to make the broken connection in the seat arc (or work). Recently I have noticed that the replaced drivers seat cover is now intermittant (and I hear a buzzing noise sometimes - and immediatly shut it off).

Quote:

Originally Posted by djones64

Can anyone tell me why the driver's side heated seat does not work, but the passenger's side does on my 99 Suburban, K2500, LT?

chuck's · #12 01-28-2005, 11:07 PM

bn2wild.The buzzing sound you are hearing could be the relay within the heated seat module.If you are eneregetic and adventurous,you could try the module from the passenger seat and put it in the drivers seat.If you have read the previous posts,you know it won't be easy.If the module has GM #25638146, it could be possible to get the module for about $20.I hope this helps
chuck's

tahoe LT 99 · #13 02-20-2006, 08:15 PM

I have a problem were all of a sudden both heated seats stopped working.....would that by a fuse maybe? what could that be?

777stickman · #14 02-22-2006, 12:46 PM

Quote:

Originally Posted by tahoe LT 99

I have a problem were all of a sudden both heated seats stopped working.....would that by a fuse maybe? what could that be?

2 fuses. Underhood fuse block 20a "FRONT HEATED SEATS". Instrument panel fuse block 10a "RR HVAC".

cris2004 · #15 08-06-2006, 06:15 PM

I have a similar situation on a 98. I was able to reach under the seat to pull out those modulators (25638146) and swap the working side for the non- working side. Both mods work in the good side and not in the broken side.

While the switch itself and the pins the modulator connects to operate the same(using a test lamp), the modulater does not 'click' on the 'broken' drivers side.
Is this a result of a bad element? It's odd that the wiring functions the same on both sides.

Thanks for any help.
Chris

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