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There has been a service bulletin for that type of concern. It involves reprogramming the door module. The dealer would have to do that, I hate to have to say.
Here is what it states.
Bulletin No.: 05-08-05-008
Date: August 18, 2005
Subject: Intermittent Heated Seats Inoperative, DTC B3941 Set (Reprogram Driver Seat Module)
All with Seat FRT, Individual (Non BKT) (RPO AN3)
2003-2005 HUMMER H2 with Seat, Front Bucket Deluxe (RPO AR9)
Some customers may comment that occasionally the seat heater will not operate when activated. If the ignition key is cycled OFF and back ON again, the heated seat will operate correctly. Also, on some LB7 diesel engine vehicles, the seat heater may turn itself off during the first 10 minutes of operation. This occurs only with the first activation for the day and works correctly with subsequent activations immediately after the event. These conditions are intermiffent and DTC B3941 may be set.
Technicians are to reprogram the driver seat module with an updated software calibration. This new service calibration was released with TIS satellite data update version 6.5 available June 13, 2005. As always, make sure your Tech 2(R) is updated with the latest software version.
File In Section: 08 Body and Accessories
Bulletin No.: 03-08-50-003
Date: January, 2003
Some customers may comment that the seat heater and/or memory seat functions are inoperative.
A logic lockup of the memory seat control module may cause this condition.