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Exactly, I couldn't get it into troubleshoot mode either, and (unfortunately) my scan tool doesn't allow me access to the climate control systems computer (or subsequent codes).
I was playing around with it a bit and I noticed that upon power up (just turn the key on, not necessarily starting the vehicle) the motor for the driver/passenger damper appears to go through a "homing" routine. Strange thing is, once it reaches full travel in one direction, it continues to try and move. Like it's driving itself in the same direction because it doesn't know it's reached the end of travel. I physically move the damper back a bit and it continues in that same direction, right back to the limit. After several times of this routine, it finally stopped and went back the other direction to that limit and continued to move against that limit. Finally, after a minute or so, it gave up and returned to a central position for what I can only assume is the preset temperature. After all that, it appeared to operate normally (i.e. - I could set the temp control and it would move accordingly). But, once I cycled power, the same behavior returned. The motor will continue to drive itself all the way to one end of travel, disregarding the preset temperature (which I left at around 72).
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