No the heated seats go on a thermostat under the individual seat. They will heat till the thermostat shuts it off. I've notice goes hot.. warm .. hot.. at least on my seat. 10 minutes from cold. seems a little long.. mine usually heats before the car heater blows out hotter air. Overall the heated seats should work in about 4-5 minutes and the ECC should start in about 7 minutes which is pretty good.
About the ECC, if your not getting any flashing or codes it should be functioning properly. Are you sure you dont have your Mix Air On. If you have that at full it'll be blowing cold air through your main vents and blowing warmer air through the other vents. But the main vents with the outside air (cold) will keep the cabin colder.
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