Chevy has some issues when it comes to heated seats. I had mine fixed twice. When mine went out it was the drivers seat, then it was the drivers back, which I never knew was broken. I had it fixed and it went out again. There seems to be a routing problem where the wires go to the seat back and attach to the plug in pigtail of the heating element. Also check your manual of chevy specs. Believe it or not some seat never had a heating element installed both back and bottom of the seats. I refused to fix it again . If you do it yourself it is too labor intensive, if the dealer does it , it is too expensive and 9 out of 10 times they install it wrong and the wires get pinched between the seats when the seat is moved back or tilted forward...Sad!
SOURCE: 03 chevy tahoe
There are seperate blowers for the front and rear air. It is most likely either your blower motor or the resistor, both located under the passenger side dash. I got a blower from a salvage yard for $25, But ended up having to get the resister from the dealership for about $130. Hope this helps.
SOURCE: Heated seats not working.
Work for a GM dealership. the problem is the heated seat pad element is bad. Replacing the element is not easy but can be done at home.
SOURCE: 2003 Envoy bottom seats not heating up, stopped working same time
I had the same issue with my 2004 XUV on the drivers side. Noticed that a "spot" was hooter than normal right before it quit. The seat heaters are basically a simple wire coil that is laid between the upholstery and the padding. The back and seat units are independent but operate off the same switch. If you are somewhat mechanically inclined, this is not a difficult fix, you just have to be patient and careful. Mine was a year ago and I think the replacement part from GM Parts Direct was less than 50 bucks. The dealer wanted over $300 to fix it. If you want me to walk you thru it let me know.
SOURCE: 2004 chevy. Heated seats will not stay on.
See GM TSB 05-08-143-001, If you have Adjustable pedals, especially if they dont; work with the memeory buttons, but function with thier own buttons. Its the Brake Pedal Position Sensor is shorted and mesing up the seat module which controls the heaters too. My 05 Suburban had the same issue.
SOURCE: Bottom portion of passenger heated seat not working
It sounds like the heating element is broken. Unfortunately they don't usually tell you that if you have heated seats, kneeling or stepping on them, even briefly (as if you were leaning in to get something from the car), or putting something heavy with a firm edge (like a heavy box), can sometimes break one or more of the wires in the heating element. I'd be willing to bet that this is what has happened. The heating elements in the seat are wired together, so it's not a case of having a heat control module for the cushion dying while the one for the backrest is OK. If the whole seat stopped heating, I'd think about looking into the controls for the seat, but with part of it still working, it's likely that the cushion heater has been damaged and will have to be repaired or replaced.
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