hey how are you
most possible causes
1- door module
2- door module reprogramming
There is a service bulletin for that type of concern. It involves reprogramming the door module. The dealer would have to do that for you
Interior - Heated Seats Intermittently Inoperative
Bulletin No.: 05-08-05-008
Date: August 18, 2005
Intermittent Heated Seats Inoperative, DTC B3941 Set (Reprogram Driver Seat Module)
2003-2005 Cadillac Escalade, Escalade ESV, Escalade EXT
2003-2005 Chevrolet Avalanche, Silverado, Suburban, Tahoe
2003-2005 GMC Sierra, Yukon, Yukon XL, Yukon Denali
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 activation immediately after the event. These conditions are intermittent 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.
Interior - Seat Heater/Power Memory Seat Inoperative
File In Section: 08 Body and Accessories
Bulletin No.: 03-08-50-003
Date: January, 2003
Seat Heater and/or Memory Power Seat Inoperative
(Replace Memory Seat Control Module) Models:
2003 Cadillac Escalade, Escalade ESV, Escalade EXT
2003 Chevrolet Avalanche, Silverado, Suburban, Tahoe
2003 GMC Sierra, Yukon, Yukon XL, Yukon Denali, Yukon Denali XL
2003 HUMMER H2
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.
please let me know if you need anything else on it
ASE Certified Technician