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Re: 2004 GMC Sierra 1500 Z71 Drivers Side Heated Seat
It is actually a somewhat common issue. Sometimes the issue is as simple as the switch, sometimes it is the module, sometimes it is the heater element itself (though usually that issue turns it off by itself, not on as is your case).
Start off by unplugging the switch in the door. Drive around for a few days and see if the heater comes on by itself still. If so, it is likely the module under the seat. If it doesn't, reinstall the switch and see if the issue comes back, if so you may need a new switch.
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