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My truck has the oem heated seats, both back and bottom, however they work opposite of what the switch shows. For instsnce, when the seat bottom switch is pushed and the back turned off, only the back heats. Is this indicative of a switch problem or a heater problem? I know the wiring plugs into the seat back and the seat bottom plugs into that, so i doubt the plugs are switched.
 

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Uplevel scantool is the best way to diagnose this. The switch communicates through the door module, which tells the seat module to turn on the heaters. There may be codes and there may not, but you need to monitor the data PIDs to see what the switch and module are doing.

Anything less is going to be a wild guess and time waster.
 
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