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All 4 heated seats stopped working even though the indicator lights work.
Gm dealer can't figure it out except to start replacing parts. These codes were found b272e and b272f .
 

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B272e Drivers seat back blower circuit open

B272f passenger seat back blower circuit open
With a failed blower circuit in each seat, the controller will switch the other blower off after a short duration, maybe a minute or so. You can probably hear the other heater/cooler blower in the seat run during that time, then the controller will turn them off when it detects a fault, but the indicator lights will still work. I had a bad blower in my 06, it was pretty easy to replace in the seat bottom. I got lucky and got one new in the box on Ebay for cheap.

This does not explain why the rear seat heater does not work, no blowers for the rear, just the old fashioned electric heaters. Pull the bottom out to see if it is plugged in first.

Dealers only follow the manual, so I'm sure they want to replace the 2 blower units driving the error codes.
 
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