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Hi, the most common fault with the seat heaters is the heating elements, your 2004 Chevrolet Tahoe would be no exception. The upper and lower elements work in series so that if one fails they both stop working. The best way to test them is to check the resistance of each heating element separately. If one or both are out of spec the faulty element will need to be replace. This will involve removing the seat cover(s) as necessary to access the element.
Possibly.... the only way I know to diagnosis this issue is with an amp meter in the circuit that heats the seats. Compare LH & RH seat heating current draw. If you find the pass seat is NOT drawing the same amount of current, further troublshooting is required. There are TWO heating elements installed in the seats -- seat bottom & seat back, and they are connected in 'SERIES'... so if either element goes/is 'OPEN', then it's component replacement time. There is a thermostat in the heating elements -- it regulates the seat temperature. One must isolate the two elements & check each one individually (seat bottom - checking resistance... and seat back - checking resistance). whichever one (or possibly both) are 'OPEN'. If you find resistance is normal (3 to 5 ohms), then the problem/cause may be in the switch (or its contacts). Using a test light (12 volt bulb), check for power (battery voltage) at the heating element connector to ground (chassis). If the bulb lights up, you know you have power at the switch and is sending it to the heating elements.
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.
I had the same problem on my 04 LeSabre. To check to see whether it was the element or the switch, I unplugged both seats and ran jumper wires to make left switch control the right element. The switch and element worked properly. Then I ran jumper wires to make right switch control the left element. The problem was the same, so it was the element was bad.
I had my element replaced at the dealership, since I didn't want to wreck my leather seats. It cost over $400 (about $150 for the element). I guess it just tucks next to the old element - the old element stays in place.