I have been having an issue getting the rear controls in the second row to work. When I switch the knob up by the shifter to "R" I get no control at the rear for fan speed/mode or temp. I did a quick search on the "old" website and found the thread below. That thread kind of fizzled out and the OP was left guessing. I am left stuck wondering which part to get. Is it a actuator module that is the culprit?
blower motor resistor - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum
blower motor resistor - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum