2004 Yukon Denali Power Heated seat issues

2004 Yukon Denali, heated seats and power seats went out this morning on the way to work. Got home, checked the MBEC1 fuse and it was blown. Replaced the fuse and the power seat now works. Heated seats still not working. I checked IGN3 and it appeared fine but I replaced it anyway. Still no heated seat. I tried both sets of controls in case the driver side switch had crapped out but no difference. I would be very grateful for any ideas.
Thanks,
Bill

Issues was solved by replacing Blower Control Module