hi, got a 05 titan that can in today. one of the complaints was anytime the blower motor was on high no matter what speed selection. checked out the description and operation and by looking at the wiring diagram it seems that depending upon how many volts (0 volts-5volts) the front air control module sent to the "resistor" you would get varriable speeds. tested wiring and was wondering how common the front air module or i call it control head goes bad on these? had no change in voltage to the red/green conrtol wire. thanks for any help.