How do you reset the heater on a 2005 Chevy Impala?

My husband found the following online -- have you ever heard of this and does it work? The problem you have is the GM heater control unit has lost it's calibration, which can happen from time to time. The way to reset it is, start your car and turn your heater off, and shut off the car, pull out the keys. Then with vehicle off, disconnect the battery, (or batteries if two). Let sit for 10 minutes, then re-connect battery. Get in and start the engine, DON'T touch anything, let the heater control unit re-calibrate for at least 40 seconds, (by the clock), then try turning on the heater. Usually problem over, hope it helps! Note: make sure the radio is turned off before disconnecting the battery and if this does not solve the problem,