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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.
this fuse controls a few things i will list them and send a copy for you.this way you can determine which asc come on this truck, but i know some do and they are needed,it controls the hvac system (heating/ ac), electronic suspension, rear wheel steering,and heated seats. instead of removing the fuse which cant be done look under the rear seats and unplug the heated seats module theres two one under each seat in the rear seats that will shut it down. hope this helps
It could be as simple as corrosion at the connector under the seat between the seat connector and the wiring harness. Otherwise check the fuse box. Pull them out to look and replace if required ( One at a time). They are marked.
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