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Message: <blockquote data-quote="BenBB" data-source="post: 1609800" data-attributes="member: 20185"><p>Yes from what I've read that's correct.  Does sound like the control unit but I don't know for sure, the one you replaced should move the blend door from defrost down to floor and then to vents if it's working right, or rather if it's getting the signal from the control unit to do so.  Again, battery ok?  The USB issue may not be related but it could point to low battery, they do some strange things when the system doesn't get voltage (mine was throwing error reading navigation card messages right before battery went)...</p></blockquote><p></p>