I tested the old Push Button Climate Control Unit by applying 12V to pin 13 Left and Ground to pin 10 Right. I then pressed the 0 button and measured the voltage at pin 12 Left (which goes to the blower control unit N29). The voltage was zero. When I pressed any of the other buttons and pressed the high fan button, the voltage jumped to about 7.6 V.
I believe this tells me that the blower control unit is fried. I will remove it and test it next.